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PHP design pattern one: namespace, automatic loading class, PSR-0 coding specification
PHP design pattern one: namespace, automatic loading class, PSR-0 coding specification
本篇文章介绍的内容是php设计模式一之命名空间、自动加载类、PSR-0编码规范 ，现在分享给大家，有需要的朋友可以参考一下
一、命名空间：解决在生产环境中多人协同开发时出现类名或函数名冲突的问题；
test1.php
<?php
namespace Test1;
function test(){
echo "Test1命名空间下的test()方法";
}
?>test2.php
<?php
namespace Test2;
function test(){
echo "Test2命名空间下的test()方法";
}
?>test.php
<?php require_once('test1.php'); require_once('test2.php'); Test1\test(); //调用Test1命名空间下的test()方法 Test2\test(); ?>
二、自动加载类：解决在项目中引入过多的依赖类文件问题；
demo1.php
<?php
class Demo1{
static function test(){
echo "Demo1类中的test()静态方法";
}
}
?>demo2.php
<?php
class Demo2{
static function test(){
echo "Demo2类中的test()静态方法";
}
}
?>demo.php
<?php
//php5.3+版本，spl_autoload_register()自动注册加载类。参数为某个自定义的函数
spl_autoload_register('autoload');
//自定义一个自动加载函数，$class为类名，无须传参。spl_autoload_register()方法自动认别
function autoload($class) {
require_once(__DIR__.'/'.$class.'.php');
}
Demo1::test();
Demo2::test();
//php5.3版本以下，使用__autoload()方法
function __autoload($class) {
require_once(__DIR__.'/'.$class.'.php');
}
?>三、PSR-0编码规范
1）、必须使用命名空间并且与文件的绝对路径一致；
2）、类名首字母须大写且与文件名保持一致；
3）、除入口文件以外其他php文件必须只有一个类且没有可执行的代码；
四、基于PSR-0编码规范编写一套基础框架
1）、目录结构
App 存放业务逻辑及功能实现的代码
|--Controller
|--Home
|--Index.php
Frame 存放与业务逻辑无关的代码，框架部分
|--Autoloader.php 自动加载类
index.php 单一入口文件Autoloader.php
<?php
namespace Frame;
class Autoloader
{
static function autoload($class)
{
require_once(BASEDIR.'/'.str_replace('\\','/',$class).'.php');
}
}
?>App/Controller/Home/Index.php
<?php
namespace App\Controller\Home;
class Index
{
static function test()
{
echo "Home控制器下的test()静态方法";
}
}
?>index.php
<?php define('BASEDIR',__DIR__); require_once(BASEDIR.'/Frame/Autoloader.php'); spl_autoload_register('Frame\\Autoloader::autoload'); App\Controller\Home\Index::test(); //输出结果：Home控制器下的test()静态方法 ?>
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