CakePHP - 概述

CakePHP 是一个开源 MVC 框架。它使开发、部署和维护应用程序变得更加容易。 CakePHP 有许多库可以减少大多数常见任务的过载。

CakePHP 的优点

使用 CakePHP 的优点如下 -

• 开源

• MVC 框架

• 模板引擎

• 缓存操作

• 搜索引擎友好的网址

• 轻松的 CRUD（创建、读取、更新、删除）数据库交互。

• 图书馆和助手

• 内置验证

• 本地化

• 电子邮件、CakePHP 快速指南、安全性、会话和请求处理组件

• 查看 AJAX、JavaScript、HTML 表单等的帮助程序

CakePHP 请求周期

下图描述了 CakePHP 中请求生命周期的工作原理 -

典型的 CakePHP 请求周期从用户请求应用程序中的页面或资源开始。在高层，每个请求都会经历以下步骤 -

• 网络服务器重写规则将请求定向到 webroot / index.php。

• 应用程序的自动加载器和引导文件已执行。

• 配置的任何调度过滤器都可以处理请求，并可以选择生成响应。

• 调度程序根据路由规则选择适当的控制器和操作。

• 调用控制器的操作，控制器与所需的模型和组件交互。

• 控制器将响应创建委托给视图以生成模型数据的输出。

• 视图使用 Helpers 和 Cells 生成响应正文和标头。

• 响应被发送回客户端。

CakePHP - 安装

在本章中，我们将展示 CakePHP 4.0.3 的安装。我们需要安装的最低 PHP 版本是 PHP 7.3.

在开始安装cakePHP之前，您需要安装PHP 7.3和Composer。

对于Windows用户，安装或更新PHP版本> 7.3的WAMP服务器。

前往 www.wampserver.com/en/download-wampserver-64bits/ 并安装它。

对于Linux用户，请参考TutorialsPoint网站，网址为www.tutorialspoint.com/php7/php7_installation_linux.htm来安装PHP。

安装 Composer

转到 https://getcomposer.org/download/ 上的 Composer，然后根据您计算机的操作系统 (OS) 单击“下载”，然后在您的系统上安装 Composer。将位置添加到 Windows 用户的 PATH 变量中，以便您可以从任何目录使用 Composer。

安装完 Composer 后，现在让我们开始安装 CakePHP。

安装 CakePHP

Windows用户进入wamp所在文件夹，在www/文件夹中创建一个文件夹cakephp4/.

对于 Linux 用户，创建文件夹 var/www/html/，然后创建文件夹 cakephp4/.

• cakephp4/ 是我们要安装 CakePHP 的文件夹。

使用composer执行以下命令 -

composer create-project --prefer-dist cakephp/app:4.0.3 cakephp4

这是命令执行时您应该看到的内容 -

安装完成后，使用 localhost 在浏览器中打开您的项目。

相同的路径是http://localhost/cakephp。

CakePHP - 文件夹结构

在这里，我们将了解 CakePHP 中的文件夹结构和命名约定。让我们从了解文件夹结构开始。

文件夹结构

看看下面的截图。它显示了 CakePHP 的文件夹结构。

下表描述了CakePHP中每个文件夹的作用 -

Naming Convention

Naming convention is not something mandatory to be followed, but is a good coding practice and will be very helpful as your project goes big.

CakePHP 快速指南 Convention

The controller class name has to be plural, PascalCased and the name has to end with CakePHP 快速指南. For example, for Students class the name of the controller can be StudentsCakePHP 快速指南. Public methods on CakePHP 快速指南s are often exposed as ‘actions’ accessible through a web browser.

For example, the /users /view maps to the view() method of the UsersCakePHP 快速指南 out of the box. Protected or private methods cannot be accessed with routing.

File and Class CakePHP 快速指南 Convention

Mostly, we have seen that our class name file name is almost the same. This is similar in cakephp.

For example, the class StudentsCakePHP 快速指南 will have the file named as StudentsCakePHP 快速指南.php. The files have to be saved as the module name and in the respective folders in app folder.

Database Conventions

The tables used for CakePHP models, mostly have names plural with underscore.

For example, student_details, student_marks. The field name has an underscore, if it is made up of two words, for example, first_name, last_name.

Model Conventions

For model, the classes are named as per database table, the names are plural, PascalCased and suffixed with Table.

For example, StudentDetailsTable, StudentMarksTable

View Conventions

For view templates, the files are based on controller functions.

For example, if the class StudentDetailsCakePHP 快速指南 has function showAll(), the view template will be named as show_all.php and saved inside template/yrmodule/show_all.php.

CakePHP - Project Configuration

In this chapter, we will understand the Environment CakePHP 快速指南, General Configuration, Database Configuration and Email Configuration in CakePHP.

Configuration CakePHP comes with one configuration file by default, and we can modify it according to our needs. There is one dedicated folder “config” for this purpose. CakePHP comes with different configuration options.

Let us start by understanding the Environment CakePHP 快速指南 in CakePHP.

Environment CakePHP 快速指南

Environment variables make the working of your application on different environments easy. For example, on dev server, test server, staging server and production server environment. For all these environments, you can make use of env() function to read the configuration for the environment you need and build your application.

In your config folder, you will come across config/.env.example. This file has all the variables that will be changed based on your environment. To start with, you can create a file in config folder i.e. config/.env and define those variables and use them. In case you need any additional variables, it can go in that file.

You can read your environment variable using env() function as shown below −

Example

$debug = env('APP_DEBUG', false);

The first one is the name of the environment variable you want and second value is the default value. The default value is used, if there is no value found for the environment variable.

General Configuration

The following table describes the role of various variables and how they affect your CakePHP application.

Databases Configuration

Database can be configured in config/app.php and config/app_local.php file. This file contains a default connection with provided parameters, which can be modified as per our choice.

The below snippet shows the default parameters and values, which should be modified as per the requirement.

Config/app_local.php

*/
   'Datasources' => [
      'default' => [
         'host' => 'localhost',
         'username' => 'my_app',
         'password' => 'secret',
         'database' => 'my_app',
         'url' => env('DATABASE_URL', null),
      ],
      /*
         * The test connection is used during the test suite.
      */
      'test' => [
         'host' => 'localhost',
         //'port' => 'non_standard_port_number',
         'username' => 'my_app',
         'password' => 'secret',
         'database' => 'test_myapp',
         //'schema' => 'myapp',
      ],
   ],

Let us understand each parameter in detail in config/app_local.php.

config/app.php

'Datasources' => [
   'default' => [
      'classCakePHP 快速指南' => Connection::class,
      'driver' => Mysql::class,
      'persistent' => false,
      'timezone' => 'UTC',
      //'encoding' => 'utf8mb4',
      'flags' => [],
      'cacheMetadata' => true,
      'log' => false,
      'quoteIdentifiers' => false,
      //'init' => ['SET GLOBAL innodb_stats_on_metadata = 0'],
   ],
]   

Let us understand each parameter in detail in config/app.php.

Email Configuration

Email can be configured in file config/app.php. It is not required to define email configuration in config/app.php. Email can be used without it. Just use the respective methods to set all configurations separately or load an array of configs. Configuration for Email defaults is created using config() and configTransport().

Email Configuration Transport

By defining transports separately from delivery profiles, you can easily re-use transport configuration across multiple profiles. You can specify multiple configurations for production, development and testing. Each transport needs a classCakePHP 快速指南. Valid options are as follows −

• Mail − Send using PHP mail function

• Smtp − Send using SMTP

• Debug − Do not send the email, just return the result

You can add custom transports (or override existing transports) by adding the appropriate file to src/Mailer/Transport. Transports should be named YourTransport.php, where 'Your' is the name of the transport.

Following is the example of Email configuration transport.

'EmailTransport' => [
   'default' => [
      'classCakePHP 快速指南' => 'Mail',
      // The following keys are used in SMTP transports
      'host' => 'localhost',
      'port' => 25,
      'timeout' => 30,
      'username' => 'user',
      'password' => 'secret',
      'client' => null,
      'tls' => null,
      'url' => env('EMAIL_TRANSPORT_DEFAULT_URL', null),
   ],
],

Email Delivery Profiles

Delivery profiles allow you to predefine various properties about email messages from your application, and give the settings a name. This saves duplication across your application and makes maintenance and development easier. Each profile accepts a number of keys.

Following is an example of Email delivery profiles.

'Email' => [
   'default' => [
   
      'transport' => 'default',
      'from' => 'you@localhost',
   ],
],

CakePHP - Routing

In this chapter, we are going to learn the following topics related to routing −

• Introduction to Routing
• Connecting Routes
• Passing CakePHP 快速指南 to Routes
• Generating urls
• CakePHP 快速指南 urls

Introduction to Routing

In this section, we will see how you can implement routes, how you can pass arguments from URL to controller’s action, how you can generate URLs, and how you can redirect to a specific URL. Normally, routes are implemented in file config/routes.php. Routing can be implemented in two ways −

• static method
• scoped route builder

Here, is an example presenting both the types.

// Using the scoped route builder.
Router::scope('/', function ($routes) {
   $routes->connect('/', ['controller' => 'CakePHP 快速指南s', 'action' => 'index']);
});
// Using the static method.
Router::connect('/', ['controller' => 'CakePHP 快速指南s', 'action' => 'index']);

Both the methods will execute the index method of CakePHP 快速指南sCakePHP 快速指南. Out of the two methods, scoped route builder gives better performance.

Connecting Routes

Router::connect() method is used to connect routes. The following is the syntax of the method −

static Cake\Routing\Router::connect($route, $defaults =[], $options =[])

There are three arguments to the Router::connect() method −

• The first argument is for the URL template you wish to match.

• The second argument contains default values for your route elements.

• The third argument contains options for the route, which generally contains regular expression rules.

Here, is the basic format of a route −

$routes->connect(
   'URL template',
   ['default' => 'defaultValue'],
   ['option' => 'matchingRegex']
);

Example

Make changes in the config/routes.php file as shown below.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
      $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/', ['controller' => 'Tests', 'action' => 'show']);
   $builder->connect('/pages/*', ['controller' => 'Pages', 'action' => 'display']);
   $builder->fallbacks();
});

Create a TestsCakePHP 快速指南.php file at src/CakePHP 快速指南/TestsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/TestsCakePHP 快速指南.php

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class TestsCakePHP 快速指南 extends AppCakePHP 快速指南 {
   public function show()
   {
   }
}

Create a folder Tests under src/Template and under that folder, create a View file called show.php. Copy the following code in that file.

src/Template/Tests/show.php

<h1>This is CakePHP tutorial and this is an example of connecting routes.</h1>

Execute the above example by visiting the following URL which is available at http://localhost/cakephp4/

Output

The above URL will yield the following output.

Passed CakePHP 快速指南

Passed arguments are the arguments which are passed in the URL. These arguments can be passed to controller’s action. These passed arguments are given to your controller in three ways.

As arguments to the action method

Following example shows, how we can pass arguments to the action of the controller. Visit the following URL at http://localhost/cakephp4/tests/value1/value2

This will match the following route line.

$builder->connect('tests/:arg1/:arg2', ['controller' => 'Tests', 'action' => 'show'],['pass' => ['arg1', 'arg2']]);

Here, the value1 from URL will be assigned to arg1 and value2 will be assigned to arg2.

As numericallyindexed array

Once the argument is passed to the controller’s action, you can get the argument with the following statement.

$args = $this->request->params[‘pass’]

The arguments passed to controller’s action will be stored in $args variable.

Using routing array

The argument can also be passed to action by the following statement −

$routes->connect('/', ['controller' => 'Tests', 'action' => 'show',5,6]);

The above statement will pass two arguments 5, and 6 to TestCakePHP 快速指南’s show() method.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
// Register scoped middleware for in scopes.
$builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('tests/:arg1/:arg2', ['controller' => 'Tests', 'action' => 'show'],['pass' => ['arg1', 'arg2']]);
   $builder->connect('/pages/*', ['controller' => 'Pages', 'action' => 'display']);
   $builder->fallbacks();
});

Create a TestsCakePHP 快速指南.php file at src/CakePHP 快速指南/TestsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/TestsCakePHP 快速指南.php

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class TestsCakePHP 快速指南 extends AppCakePHP 快速指南 {
public function show($arg1, $arg2) {
      $this->set('argument1',$arg1);
      $this->set('argument2',$arg2);
   }
}

Create a folder Tests at src/Template and under that folder create a View file called show.php. Copy the following code in that file.

src/Template/Tests/show.php.

<h1>This is CakePHP tutorial and this is an example of Passed arguments.</h1>
<?php echo "Argument-1:".$argument1."<br/>";
   echo "Argument-2:".$argument2."<br>";
?>

Execute the above example by visiting the following URL http://localhost/cakephp4/tests/CakePHP 快速指南/Kunal

Output

Upon execution, the above URL will produce the following output.

Generating URLs

This is a cool feature of CakePHP. Using the generated URLs, we can easily change the structure of URL in the application without modifying the whole code.

url( string|array|null $url null , boolean $full false )

The above function will take two arguments −

• The first argument is an array specifying any of the following - 'controller', 'action', 'plugin'. Additionally, you can provide routed elements or query string parameters. If string, it can be given the name of any valid url string.

• If true, the full base URL will be prepended to the result. Default is false.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/generate',['controller'=>'Generates','action'=>'show']);
   $builder->fallbacks();
});

Create a GeneratesCakePHP 快速指南.php file at src/CakePHP 快速指南/GeneratesCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/GeneratesCakePHP 快速指南.php

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
21
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class GeneratesCakePHP 快速指南 extends AppCakePHP 快速指南 {
   public function show()
   {
   }
}

Create a folder Generates at src/Template and under that folder, create a View file called show.php. Copy the following code in that file.

src/Template/Generates/show.php

<h1>This is CakePHP tutorial and this is an example of Generating URLs<h1>
</h1>
</h1>

Execute the above example by visiting the following URL −

http://localhost/cakephp4/generate

Output

The above URL will produce the following output −

CakePHP 快速指南 Routing

CakePHP 快速指南 routing is useful, when we want to inform client applications that, this URL has been moved. The URL can be redirected using the following function −

static Cake\Routing\Router::redirect($route, $url, $options =[])

There are three arguments to the above function as follows −

• A string describing the template of the route.

• A URL to redirect to.

• An array matching the named elements in the route to regular expressions which that element should match.

Example

Make Changes in the config/routes.php file as shown below. Here, we have used controllers that were created previously.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/generate',['controller'=>'Generates','action'=>'show']);
   $builder->redirect('/redirect','https://tutorialspoint.com/');
   $builder->fallbacks();
});

Execute the above example by visiting the following URLs.

URL 1 − http://localhost/cakephp4/generate

Output for URL 1

URL 2 − http://localhost/cakephp4/redirect

Output for URL 2

You will be redirected to https://tutorialspoint.com

CakePHP - CakePHP 快速指南s

The controller as the name indicates controls the application. It acts like a bridge between models and views. CakePHP 快速指南s handle request data, makes sure that correct models are called and right response or view is rendered.

Methods in the controllers’ class are called actions. Each controller follows naming conventions. The CakePHP 快速指南 class names are in plural form, Camel Cased, and end in CakePHP 快速指南 — PostsCakePHP 快速指南.

AppCakePHP 快速指南

The AppConttroller class is the parent class of all applications’ controllers. This class extends the CakePHP 快速指南 class of CakePHP. AppCakePHP 快速指南 is defined at src/CakePHP 快速指南/AppCakePHP 快速指南.php. The file contains the following code.

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
use Cake\CakePHP 快速指南\CakePHP 快速指南;
class AppCakePHP 快速指南 extends CakePHP 快速指南 {
   public function initialize(): void {
      parent::initialize();
      $this->loadComponent('RequestHandler');
      $this->loadComponent('Flash');
   }
}

AppCakePHP 快速指南 can be used to load components that will be used in every controller of your application. The attributes and methods created in AppCakePHP 快速指南 will be available in all controllers that extend it. The initialize() method will be invoked at the end of controller’s constructor to load components.

CakePHP 快速指南 Actions

The methods in the controller class are called Actions. These actions are responsible for sending appropriate response for browser/user making the request. View is rendered by the name of action, i.e., the name of method in controller.

Example

class RecipesCakePHP 快速指南 extends AppCakePHP 快速指南 {
   public function view($id) {
      // Action logic goes here.
   }
   public function share($customerId, $recipeId) {
      // Action logic goes here.
   }
   public function search($query) {
      // Action logic goes here.
   }
}

As you can see in the above example, the RecipesCakePHP 快速指南 has 3 actions − View, Share, and Search.

CakePHP 快速指南ing

For redirecting a user to another action of the same controller, we can use the setAction() method. The following is the syntax for the setAction() method.

Cake\CakePHP 快速指南\CakePHP 快速指南::setAction($action, $args...)

The following code will redirect the user to index action of the same controller.

$this->setAction('index');

The following example shows the usage of the above method.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf'); 
   $builder->connect('/redirect-controller',['controller'=>'CakePHP 快速指南s','action'=>'action1']);
   $builder->connect('/redirect-controller2',['controller'=>'CakePHP 快速指南s','action'=>'action2']);
   $builder->fallbacks();
});

Create a CakePHP 快速指南sCakePHP 快速指南.php file at src/CakePHP 快速指南/CakePHP 快速指南sCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/CakePHP 快速指南sCakePHP 快速指南.php

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class CakePHP 快速指南sCakePHP 快速指南 extends AppCakePHP 快速指南 {
   public function action1() {
   }
   public function action2(){
      echo "redirecting from action2";
      $this->setAction('action1');
   }
}

Create a directory CakePHP 快速指南s at src/Template and under that directory create a View file called action1.php. Copy the following code in that file.

src/Template/CakePHP 快速指南s/action1.php

<h1>This is an example of how to redirect within controller.</h1>

Execute the above example by visiting the following URL.

http://localhost/cakephp4/redirect-controller

Output

Upon execution, you will receive the following output.

Now, visit the following URL: http://localhost/cakephp4/redirect-controller2

The above URL will give you the following output.

Loading Models

In CakePHP, a model can be loaded using the loadModel() method. The following is the syntax for the loadModel() method −

Cake\CakePHP 快速指南\CakePHP 快速指南::loadModel(string $modelClass, string $type)

There are two arguments to the above function as follows −

• The first argument is the name of model class.

• The second argument is the type of repository to load.

Example

If you want to load CakePHP 快速指南s model in a controller, then it can be loaded by writing the following line in controller’s action.

$this->loadModel('CakePHP 快速指南s');

CakePHP - Views

The letter “V” in the MVC is for Views. Views are responsible for sending output to user based on request. View Classes is a powerful way to speed up the development process.

View Templates

The View Templates file of CakePHP gets data from controller and then render the output so that it can be displayed properly to the user. We can use variables, various control structures in template.

Template files are stored in src/Template/, in a directory named after the controller that uses the files, and named after the action it corresponds to. For example, the Viewfile for the Products controller’s “view()” action, would normally be found in src/Template/Products/view.php.

In short, the name of the controller (ProductsCakePHP 快速指南) is same as the name of the folder (Products) but without the word CakePHP 快速指南 and name of action/method (view()) of the controller (ProductsCakePHP 快速指南) is same as the name of the View file(view.php).

View CakePHP 快速指南

View variables are variables which get the value from controller. We can use as many variables in view templates as we want. We can use the set() method to pass values to variables in views. These set variables will be available in both the view and the layout your action renders. The following is the syntax of the set() method.

Cake\View\View::set(string $var, mixed $value)

This method takes two arguments − the name of the variable and its value.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   // Register scoped middleware for in scopes.
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('template',['controller'=>'Products','action'=>'view']);
   $builder->fallbacks();
});

Create a ProductsCakePHP 快速指南.php file at src/CakePHP 快速指南/ProductsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/ProductsCakePHP 快速指南.php

<?php declare(strict_types=1);
namespace App\CakePHP 快速指南;
use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Response;
use Cake\View\Exception\MissingTemplateException;
class ProductsCakePHP 快速指南 extends AppCakePHP 快速指南 {
public function view(){
      $this->set('Product_CakePHP 快速指南','XYZ');
   }
}

Create a directory Products at src/Template and under that folder create a View file called view.php. Copy the following code in that file.

Value of variable is: <?php echo $Product_CakePHP 快速指南; ? >

Execute the above example by visiting the following URL.

http://localhost/cakephp4/template

Output

The above URL will produce the following output.

CakePHP - Extending Views

Many times, while making web pages, we want to repeat certain part of pages in other pages. CakePHP has such facility by which one can extend view in another view and for this, we need not repeat the code again.

The extend() method is used to extend views in View file. This method takes one argument, i.e., the name of the view file with path. Don’t use extension .ctp while providing the name of the View file.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('extend',['controller'=>'Extends','action'=>'index']);
   $builder->fallbacks();
});

Create an ExtendsCakePHP 快速指南.php file at src/CakePHP 快速指南/ExtendsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/ExtendsCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   class ExtendsCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
      }
   }
?>

Create a directory Extends at src/Template and under that folder create a View file called header.php. Copy the following code in that file.

src/Template/Extends/header.php

<div align="center">
   <h1>Common Header</h1>
</div>
= $this->fetch('content') ?>

Create another View under Extends directory called index.php. Copy the following code in that file. Here, we are extending the above view header.php.

src/Template/Extends/index.php

<?php $this->extend('header'); ?>
This is an example of extending view.

Execute the above example by visiting the following URL http://localhost/cakephp4/extend

Output

Upon execution, you will receive the following output.

CakePHP - View Elements

Certain parts of the web pages are repeated on multiple web pages, but at different locations. CakePHP can help us reuse these repeated parts. These reusable parts are called Elements - help box, extra menu, etc. An element is basically a mini-view. We can also pass variables in elements.

Cake\View\View::element(string $elementPath, array $data, array $options =[]

There are three arguments to the above function as follows −

• The first argument is the name of the template file in the /src/Template/element/ folder.

• The second argument is the array of data to be made available to the rendered view.

• The third argument is for the array of options. e.g. cache.

Out of the 3 arguments, the first one is compulsory, while the rest are optional.

Example

Create an element file at src/Template/element directory called helloworld.php. Copy the following code in that file.

src/Template/element/helloworld.php

<p>Hello World</p>

Create a folder Elems at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Elems/index.php

Element Example: <?php echo $this->element('helloworld'); ?>

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   $builder->connect('/element-example',['controller'=>'Elems','action'=>'index']);
   $builder->fallbacks();
});

Create an ElemsCakePHP 快速指南.php file at src/CakePHP 快速指南/ElemsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/ElemsCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   class ElemsCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
      }
   }
?>

Execute the above example by visiting the following URL http://localhost/cakephp4/element-example

Output

Upon execution, the above URL will give you the following output.

CakePHP - View Events

There are several callbacks/events that we can use with View Events. These events are helpful to perform several tasks before something happens or after something happens. The following is a list of callbacks that can be used with CakePHP −

CakePHP - Working with Database

Working with database in CakePHP is very easy. We will understand the CRUD (Create, Read, Update, Delete) operations in this chapter.

Further, we also need to configure our database in config/app_local.php file.

'Datasources' => [
   'default' => [
      'host' => 'localhost',
      'username' => 'my_app',
      'password' => 'secret',
      'database' => 'my_app',
      'url' => env('DATABASE_URL', null),
   ],
   /*
      * The test connection is used during the test suite.
   */
   'test' => [
      'host' => 'localhost',
      //'port' => 'non_standard_port_number',
      'username' => 'my_app',
      'password' => 'secret',
      'database' => 'test_myapp',
      //'schema' => 'myapp',
   ],
],

The default connection has following details −

'host' => 'localhost',
   'username' => 'my_app',
   'password' => 'secret',
   'database' => 'my_app',

You can change the details, i.e. host, username, password and database as per your choice.

Once done, make sure it is updated in config/app_local.php in Datasources object.

Now, we will continue with above details, go to your phpmyadmin or mysql database and create user my_app as shown below −

Give the necessary privileges and save it. Now, we have the database details as per the configuration mentioned in app_local.php. When you check CakePHP home page, this is what you should get −

Now, we will create the following users’ table in the database.

CREATE TABLE `users` ( 
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `username` varchar(50) NOT NULL, 
   `password` varchar(255) NOT NULL, PRIMARY KEY (`id`) 
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=latin1

Insert a Record

To insert a record in database, we first need to get hold of a table using TableRegistry class. We can fetch the instance out of registry using get() method. The get() method will take the name of the database table as an argument.

This new instance is used to create new entity. Set necessary values with the instance of new entity. We now have to call the save() method with TableRegistry class’s instance which will insert new record in database.

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/add', ['controller' => 'Users', 'action' => 'add']);
   $builder->fallbacks();
});

Create a UsersCakePHP 快速指南.php file at src/CakePHP 快速指南/UsersCakePHP 快速指南.php. Copy the following code in the controller file.

src/controller/UsersCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
use App\CakePHP 快速指南\AppCakePHP 快速指南;
use Cake\ORM\TableRegistry;
use Cake\Datasource\ConnectionManager;
use Cake\Auth\DefaultPasswordHasher;
class UsersCakePHP 快速指南 extends AppCakePHP 快速指南{
   public function add(){
      if($this->request->is('post')){
         $username = $this->request->getData('username');
         $hashPswdObj = new DefaultPasswordHasher;
         $password = $hashPswdObj->hash($this->request->getData('password'));
         $users_table = TableRegistry::get('users');
         $users = $users_table->newEntity($this->request->getData());
         $users->username = $username;
         $users->password = $password;
         $this->set('users', $users);
         if($users_table->save($users))
         echo "User is added.";
      }
   }
}
?>

Create a directory Users at src/Template and under that directory create a View file called add.php. Copy the following code in that file.

src/Template/Users/add.php

<?php echo $this->Form->create(NULL,array('url'=>'/users/add'));
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL. http://localhost/cakephp4/users/add

Output

Upon execution, you will receive the following output.

The data will be saved in the users table as shown below −

CakePHP - View a Record

To view records of database, we first need to get hold of a table using the TableRegistry class. We can fetch the instance out of registry using get() method. The get() method will take the name of the database table as argument.

Now, this new instance is used to find records from database using find() method. This method will return all records from the requested table.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users', ['controller' => 'Users', 'action' => 'index']);
   $builder->fallbacks();
});

Create a UsersCakePHP 快速指南.php file at src/CakePHP 快速指南/UsersCakePHP 快速指南.php. Copy the following code in the controller file.

src/controller/UsersCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
   }
?>

Create a directory Users at src/Template, ignore if already created, and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Users/index.ctp

<a href="add">Add User</a>

Execute the above example by visiting the following URL http://localhost/cakephp4/users

Output

Upon execution, the above URL will give you the following output.

CakePHP - Update a Record

To update a record in database, we first need to get hold of a table using TableRegistry class. We can fetch the instance out of registry using the get() method. The get() method will take the name of the database table as an argument. Now, this new instance is used to get particular record that we want to update.

Call the get() method with this new instance, and pass the primary key to find a record, which will be saved in another instance. Use this instance, to set new values that you want to update and then, finally call the save() method with the TableRegistry class’s instance to update record.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/edit', ['controller' => 'Users', 'action' => 'edit']);
   $builder->fallbacks();
});

Create a UsersCakePHP 快速指南.php file at src/CakePHP 快速指南/UsersCakePHP 快速指南.php. Copy the following code in the controller file.

src/controller/UsersCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
      public function edit($id){
         if($this->request->is('post')){
            $username = $this->request->getData('username');
            $password = $this->request->getData('password');
            $users_table = TableRegistry::get('users');
            $users = $users_table->get($id);
            $users->username = $username;
            $users->password = $password;
            if($users_table->save($users))
            echo "User is udpated";
            $this->setAction('index');
         } else {
            $users_table = TableRegistry::get('users')->find();
            $users = $users_table->where(['id'=>$id])->first();
            $this->set('username',$users->username);
            $this->set('password',$users->password);
            $this->set('id',$id);
         }
      }
   }
?>

Create a directory Users at src/Template, ignore if already created, and under that directory create a view called index.php. Copy the following code in that file.

src/Template/Users/index.php

<a href="add">Add User</a>

Create another View file under the Users directory called edit.php and copy the following code in it.

src/Template/Users/edit.php

<?php echo $this->Form->create(NULL,array('url'=>'/users/edit/'.$id));
   echo $this->Form->control('username',['value'=>$username]);
   echo $this->Form->control('password',['value'=>$password]);
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Execute the above example by visiting the following URL and click on Edit link to edit record.

http://localhost/cakephp4/users

Output

After visiting the above URL, it will display the records in users table as shown below −

Click on Edit button and it will display you following screen −

Now, we will update the name CakePHP 快速指南 to CakePHP 快速指南123 and submit the details. The next screen displayed will be as follows −

CakePHP - Delete a Record

To delete a record in database, we first need to get hold of a table using the TableRegistry class. We can fetch the instance out of registry using the get() method. The get() method will take the name of the database table as an argument. Now, this new instance is used to get particular record that we want to delete.

Call the get() method with this new instance and pass the primary key to find a record which will be saved in another instance. Use the TableRegistry class’s instance to call the delete method to delete record from database.

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/users/delete', ['controller' => 'Users', 'action' => 'delete']);
   $builder->fallbacks();
});

Create a UsersCakePHP 快速指南.php file at src/CakePHP 快速指南/UsersCakePHP 快速指南.php. Copy the following code in the controller file.

src/controller/UsersCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   use Cake\ORM\TableRegistry;
   use Cake\Datasource\ConnectionManager;
   class UsersCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
         $users = TableRegistry::get('users');
         $query = $users->find();
         $this->set('results',$query);
      }
      public function delete($id){
         $users_table = TableRegistry::get('users');
         $users = $users_table->get($id);
         $users_table->delete($users);
         echo "User deleted successfully.";
         $this->setAction('index');
      }
   }
?>

Just create an empty View file under Users directory called delete.ctp.

src/Template/Users/delete.ctp

Create a directory Users at src/Template, ignore if already created, and under that directory create a Viewfile called index.ctp. Copy the following code in that file.

src/Template/Users/index.ctp

<a href="add">Add User</a>

Execute the above example by visiting the following URL and click on Delete link to delete record.

http://localhost:85/CakePHP/users

Output

After visiting the above URL and clicking on the Delete link, you will receive the following output where you can delete record.

Click on Delete link to delete the record.

CakePHP - Services

This chapter deals with the information about the authentication process available in CakePHP.

CakePHP 快速指南

CakePHP 快速指南 is the process of identifying the correct user. CakePHP supports three types of authentication.

• FormAuthenticate − It allows you to authenticate users based on form POST data. Usually, this is a login form that users enter information into. This is default authentication method.

• BasicAuthenticate − It allows you to authenticate users using Basic HTTP authentication

• DigestAuthenticate − It allows you to authenticate users using Digest HTTP authentication.

Example for FormCakePHP 快速指南

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Core\Plugin;
use Cake\Routing\RouteBuilder;
use Cake\Routing\Router;
Router::defaultRouteClass('DashedRoute');
Router::scope('/', function (RouteBuilder $routes) {
   $routes->connect('/auth',['controller'=>'Authexs','action'=>'index']);
   $routes->connect('/login',['controller'=>'Authexs','action'=>'login']);
   $routes->connect('/logout',['controller'=>'Authexs','action'=>'logout']);
   $routes->fallbacks('DashedRoute');
});
Plugin::routes();

Change the code of AppCakePHP 快速指南.php file as shown in the following program.

src/CakePHP 快速指南/AppCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
use Cake\CakePHP 快速指南\CakePHP 快速指南;
use Cake\Event\Event;
use Cake\CakePHP 快速指南\Component\AuthComponent;
class AppCakePHP 快速指南 extends CakePHP 快速指南 {
   public function initialize() {
      parent::initialize();
      $this->loadComponent('RequestHandler');
      $this->loadComponent('Flash');
         $this->loadComponent('Auth', [
            'authenticate' => [
               'Form' => [
                  'fields' => [
               'username' => 'username',
               'password' => 'password'
            ]
         ]
      ],
      'loginAction' => [
         'controller' => 'Authexs',
         'action' => 'login'
      ],
      'loginCakePHP 快速指南' => [
         'controller' => 'Authexs',
         'action' => 'index'
      ],
      'logoutCakePHP 快速指南' => [
         'controller' => 'Authexs',
         'action' => 'login'
      ]
   ]);
}
public function beforeFilter(Event $event) {
      $this->Auth->allow(['index','view']);
      $this->set('loggedIn', $this->Auth->user());
   }
}

Create AuthexsCakePHP 快速指南.php file at src/CakePHP 快速指南/AuthexsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/AuthexsCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
use App\CakePHP 快速指南\AppCakePHP 快速指南;
use Cake\ORM\TableRegistry;
use Cake\Datasource\ConnectionManager;
use Cake\Event\Event;
use Cake\Auth\DefaultPasswordHasher;
class AuthexsCakePHP 快速指南 extends AppCakePHP 快速指南 {
   var $components = array('Auth');
   public function index(){
   }
   public function login(){
      if($this->request->is('post')) {
         $user = $this->Auth->identify();
         if($user){
            $this->Auth->setUser($user);
            return $this->redirect($this->Auth->redirectUrl());
         } else
         $this->Flash->error('Your username or password is incorrect.');
      }
   }
   public function logout(){
      return $this->redirect($this->Auth->logout());
   } 
}
?>

Create a directory Authexs at src/Template and under that directory create a View file called login.php. Copy the following code in that file.

src/Template/Authexs/login.php

<?php echo $this->Form->create();
   echo $this->Form->control('username');
   echo $this->Form->control('password');
   echo $this->Form->button('Submit');
   echo $this->Form->end();
?>

Create another View file called logout.php. Copy the following code in that file.

src/Template/Authexs/logout.php

You are successfully logged out.

Create another View file called index.php. Copy the following code in that file.

src/Template/Authexs/index.php

You are successfully logged in. 
<?php echo $this->Html->link('logout',[
      "controller" => "Authexs","action" => "logout"
   ]); 
?>

Execute the above example by visiting the following URL.

http://localhost/cakephp4/auth

输出

由于身份验证已完成，一旦您尝试访问上述网址，您将被重定向到如下所示的登录页面。

提供正确的凭据后，您将登录并重定向到如下所示的屏幕。

点击注销链接后，您将再次重定向到登录屏幕。

CakePHP - 错误和异常处理

系统故障需要得到有效的处理，以保证系统的顺利运行。 CakePHP 带有默认的错误捕获，当发生错误时打印并记录错误。同样的错误处理程序用于捕获异常。

错误处理程序在 debug 为 true 时显示错误，并在 debug 为 false 时记录错误。 CakePHP 有许多异常类，内置的异常处理将捕获任何未捕获的异常并呈现有用的页面。

错误和异常配置

错误和异常可以在文件configapp.php中配置。错误处理接受一些选项，允许您为应用程序定制错误处理 -

表>

Example

Make changes in the config/routes.php file as shown in the following code.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('/exception/:arg1/:arg2',
      ['controller'=>'Exps','action'=>'index'],
      ['pass' => ['arg1', 'arg2']]);
   $builder->fallbacks();
});

登录后复制

Create ExpsCakePHP 快速指南.php file at src/CakePHP 快速指南/ExpsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/ExpsCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   use Cake\Core\Exception\Exception;
   class ExpsCakePHP 快速指南 extends AppCakePHP 快速指南 {
      public function index($arg1,$arg2) {
         try{
            $this->set('argument1',$arg1);
            $this->set('argument2',$arg2);
            if(($arg1 > 1 || $arg1 > 10) || ($arg2  10))
               throw new Exception("One of the number is out of range [1-10].");
         } catch(\Exception $ex){
            echo $ex->getMessage();
         }
      }
   }
?>

登录后复制

Create a directory Exps at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Exps/index.php

This is CakePHP tutorial and this is an example of Passed arguments.<br>
Argument-1: =$argument1?><br>
Argument-2: =$argument2?><br>

登录后复制

Execute the above example by visiting the following URL.

http://localhost/cakephp4/exception/5/0

Output

Upon execution, you will receive the following output.

CakePHP - Logging

Logging in CakePHP is a very easy task. You just have to use one function. You can log errors, exceptions, user activities, action taken by users, for any background process like cronjob. Logging data in CakePHP is easy. The log() function is provided by the LogTrait, which is the common ancestor for almost all CakePHP classes.

Logging Configuration

We can configure the log in file config/app.php. There is a log section in the file, where you can configure logging options as shown in the following screenshot.

By default, you will see two log levels − error and debug already configured for you. Each will handle different level of messages.

CakePHP supports various logging levels as shown below −

• Emergency − System is unusable

• Alert − Action must be taken immediately

• Critical − Critical conditions

• Error − Error conditions

• Warning − Warning conditions

• Notice − Normal but significant condition

• Info − Informational messages

• Debug − Debug-level messages

Writing to Log file

There are two ways by which, we can write in a Log file.

The first is to use the static write() method. The following is the syntax of the static write() method.

选项	数据类型	描述
错误级别	int	Option Data Type Description errorLevel int The level of errors you are interested in capturing. Use the built-in php error constants, and bitmasks to select the level of error you are interested in. trace bool Include stack traces for errors in log files. Stack traces will be included in the log after each error. This is helpful for finding where/when errors are being raised. exceptionRenderer string The class responsible for rendering uncaught exceptions. If you choose a custom class, you should place the file for that class in src/Error. This class needs to implement a render() method. log bool When true, exceptions + their stack traces will be logged to CakeLogLog. skipLog array An array of exception class names that should not be logged. This is useful to remove NotFoundExceptions or other common, but uninteresting logs messages. extraFatalErrorMemory int Set to the number of megabytes to increase the memory limit by, when a fatal error is encountered. This allows breathing room to complete logging or error handling. 您有兴趣捕获的错误级别。使用内置的 php 错误常量和位掩码来选择您感兴趣的错误级别。
跟踪	布尔	在日志文件中包含错误的堆栈跟踪。每次错误后，堆栈跟踪将包含在日志中。这有助于查找发生错误的位置/时间。
异常渲染器	字符串	负责渲染未捕获异常的类。如果您选择自定义类，则应将该类的文件放置在src/Error中。该类需要实现 render() 方法。
日志	布尔	当 true 时，异常及其堆栈跟踪将被记录到 CakeLogLog。
跳过日志	数组	不应记录的异常类名称数组。这对于删除 NotFoundExceptions 或其他常见但无趣的日志消息很有用。
额外的致命错误内存	int	设置为在遇到致命错误时增加内存限制的兆字节数。这为完成日志记录或错误处理提供了喘息的空间。

Syntax	write( integer|string $level, mixed $message, string|array $context [] )
Parameters	The severity level of the message being written. The value must be an integer or string matching a known level. Message content to log. Additional data to be used for logging the message. The special scope key can be passed to be used for further filtering of the log engines to be used. If a string or a numerically index array is passed, it will be treated as the scope key. See Cake\Log\Log::config() for more information on logging scopes.
Returns	boolean
Description	Writes the given message and type to all of the configured log adapters. Configured adapters are passed both the $level and $message variables. $level is one of the following strings/values.

The second is to use the log() shortcut function available on any using the LogTrait Calling log() will internally call Log::write() −

Example

Make changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use Cake\Http\Middleware\CsrfProtectionMiddleware;
use Cake\Routing\Route\DashedRoute;
use Cake\Routing\RouteBuilder;
$routes->setRouteClass(DashedRoute::class);
$routes->scope('/', function (RouteBuilder $builder) {
   $builder->registerMiddleware('csrf', new CsrfProtectionMiddleware([
      'httpOnly' => true,
   ]));
   $builder->applyMiddleware('csrf');
   //$builder->connect('/pages',
      ['controller'=>'Pages','action'=>'display', 'home']);
   $builder->connect('logex',['controller'=>'Logexs','action'=>'index']);
   $builder->fallbacks();
});

Create a LogexsCakePHP 快速指南.php file at src/CakePHP 快速指南/LogexsCakePHP 快速指南.php. Copy the following code in the controller file.

src/CakePHP 快速指南/LogexsCakePHP 快速指南.php

<?php namespace App\CakePHP 快速指南;
   use App\CakePHP 快速指南\AppCakePHP 快速指南;
   use Cake\Log\Log;
   class LogexsCakePHP 快速指南 extends AppCakePHP 快速指南{
      public function index(){
         /*The first way to write to log file.*/
         Log::write('debug',"Something didn't work.");
         /*The second way to write to log file.*/
         $this->log("Something didn't work.",'debug');
      }
   }
?>

Create a directory Logexs at src/Template and under that directory create a View file called index.php. Copy the following code in that file.

src/Template/Logexs/index.php

Something is written in log file. Check log file logs\debug.log

Execute the above example by visiting the following URL.

http://localhost/cakephp4/logex

Output

Upon execution, you will receive the following output.

The logs will be added to log/debug.log file −

CakePHP - Form Handling

CakePHP provides various in built tags to handle HTML forms easily and securely. Like many other PHP frameworks, major elements of HTML are also generated using CakePHP. Following are the various functions used to generate HTML elements.

The following functions are used to generate select options −

The following functions are used to generate HTML select element.

The following functions are used to generate button on HTML page.

The following functions are used to generate checkbox on HTML page.

以下函数用于在 HTML 页面上创建表单。

。

以下函数用于在 HTML 页面上创建隐藏元素。

The following functions are used to generate textarea element on HTML page.