Views of ThinkPHP framework_PHP tutorial

1. View

1. The composition of view components:

1) View class

View class

Smarty class

2) Template

Tpl/project/module/***.html

The view class is responsible for reading the template content, implementing string replacement, and finally outputting it to the user

2. Template definition

Default template file definition rules:

Template directory/[group name/] module name/operation name + template suffix

TMPL_TEMPLATE_SUFFIX

Generally, the suffixes of templates generally use the following types:

.html

.html

.tpl

3. Separator

Because each template designer has different habits, some people are used to using "{}" and some people use <{}> {**}

In the configuration file, you can set the following two configuration options, which represent the delimiter of the configuration template

'TMPL_L_DELIM'=>'<{',

'TMPL_R_DELIM'=>'}>',

4. Template assignment and output

1) $this->assign(‘template variable name’, variable);

$var = 'Mobile phone';
                         
           $this->assign('var',$var);
                         
            $this->display('test');

2) $this->assign(array variable);

<{$array element subscript}>

<{$price}>

<{$address}>

$var = 'Mobile phone';
                         
           $this->assign('var',$var);
                         
          $arr['price'] = 33.3;
          $arr['address'] = 'Beijing';
          $this->assign($arr);
           $this->display('test');
}

3) $this->display(‘operation name’)

The specified operation name under the current module.html template

4) $this->display(‘Module: operation name’); //Template can be called across modules

​​​​Refer to the specified operation name.html template under the specified module

5) $this->display(‘Operation’, ‘Output encoding’, ‘Output type’);

//Cross-module output
           $this->display('User:login','utf-8','text/html');

5. Template replacement (template constant)

Resources such as css, js, and images that are often cited in projects need to be cited.

__PUBLIC__: The public directory of the current website

__APP__: URL address of the current project

__GROUP__: URL address of the current group

__URL__: URL address of the current module

__ACTION__: URL address of the current operation

In the template in tp, you can use the above template constants, which represent different strings. Generally, you can use the above constants when you need to reference the URL

By default: if we access:

Localost/index.php/home/product/test, if the template uses the __PUBLIC__ template constant, then its value points to the htdocs directory of apache, but if we have multiple projects, there will be Conflict, how to resolve it?

Solution:

1) Modify configuration file

In the configuration file, you can configure an option called TMPL_PARSE_STRING, which can define the value of the template constant used in the template

Then, in the template, you can reference the resource files under the current project like this:

2) Configure virtual host

Open the host file:

Open httpd.conf

Remove the # before the above configuration options

Open the httpd-vhosts.conf file and add new virtual host settings

Restart apache

Localhost---àapache/htdocs/

Tp.com-----àapache/htdocs/tp/

6、 获取内容

$this->fetch();

Display：读取模板、替换内容、输出

Fetch：读取模板、替换内容、返回字符串（主要用于生成静态页）

二、模板

1、 模板注释：

l  {/* 注释内容 */ }

l  {// 注释内容 }

Tp中的模板注释主要是给模板设计者或程序设计者来看的

2、 变量输出：

程序向模板中赋值

普通变量

       $name

数组变量

       $row

对象变量

       $obj

代码示例：

Php程序：

模板程序：

3、 系统变量   （模板中的系统变量）

l  $Think.server        $_SERVER

l  $Think.get               $_GET

l  $Think.post             $_POST

l  $Think.request         $_REQUEST

l  $Think.cookie          $_COOKIE

l  $Think.session         $_SESSION

l  $Think.config          读取配置文件      

4、 使用函数

l  格式

       {$name|fn1|fn2=arg1,arg2,###}

5、 默认值

{$变量|default="默认值"}

6、 运算符

l  +              {$a+$b}

l  -        {$ab}

l  *              {$a*$b}

l  /        {$a/$b}

l  %             {$a%$b}

l  ++            {$a++} 或  {++$a}

l  --              {$a--}  或 {--$a}

7、 内置标签

<{$title}>

<标签>

l  闭合标签

l  开放标签

8. Include files

is the entry file location based on the project.

./Tpl/Admin/Public/header.html

We put the public parts of the web page into two public template pages, header.html and footer.html, and use include to reference them in the home page

When referencing the file above, the path is too long. How to solve it?

means referencing the specified template in the specified template under the current project

Use include to include the footer and header files under the "Public module"

Include tag allows passing parameters to the template

Template code:

9. Import files

In tp, several tags are provided to implement (simplify) references to resource files

l Format:

file (required): resource file

type (optional): resource file type, the default is js

The starting path is the Public (__PUBLIC__) directory of the website

Use namespace method

Directory.Directory.File name

10. volist tag

Used to traverse array elements

l Format:

                   {$vo.id}

                                 {$vo.name}

l name (required): array variable to be traversed

l id (required): current array element

l offset: The offset of the data to be output

l length: The length of the output data, you need to specify offset

l key: Loop index key value defaults to i

11. foreach tag

Used to traverse array variables

Syntax:

                   {$vo.id}

                                 {$vo.name}

Name: Array variable to be traversed

Item: variable name used to save the current element

If you have special needs, use volist, otherwise use foreach

12. for tag

                 {$i}

Properties:

l start (required): loop variable start value

l end (required): loop variable end value (not included)

l name (optional): loop variable name, the default value is i

l step (optional): step value, the default value is 1

13. switch tag

l Format:

Output content 1

Output content 2

Default

14. empty tag

l name is empty

15. assign tag

l

16. if tag

l if

l elseif

l else

When judging, you need to use the following connectors

l eq or equal: equal to

l neq or notequal: not equal to

l gt: greater than

l egt: greater than or equal to

l lt: less than

l elt: less than or equal to

l heq: constant equal to

l nheq: not always equal

17. Use php code

1)echo “hello”;

2)

In the configuration file, there is an option to control whether the second method is available

TMPL_DENY_PHP can disable the second method

Recommendation: Use as little php code in templates as possible