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Automatic loading of PHP classes

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Release： 2023-03-24 20:40:01

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The content of this article is about the automatic loading of PHP classes. It has a certain reference value. Now I share it with everyone. Friends in need can refer to it.

Write a HumanModel.php## first. #

class HumanModel {
    public function t() {
        echo &#39;人类<br >&#39;;
    }
}

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// =Example= //

require(&#39;./HumanModel.php&#39;);$lisi = new HumanModel();$lisi->t(); // 人类

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// =Automatic loading of classes= //

function __autoload($c) {
    echo &#39;~~~~~~~~~&#39;,$c,&#39;~~~~~~~~&#39;;
}$ming = new Dog();

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// === Notes Part 1===

Automatic loading of classes

If a non-existent class is called,

Before reporting an error, we can also use the __autoload function
Get an intervention opportunity

The system will call the __autoload() function

and automatically pass the "class name" to the __autoload function

We can load in __autoload Required classes

function __autoload($c) {
    echo &#39;我先自动加载&#39;;    echo &#39;./&#39; . $c . &#39;.php&#39;;    echo &#39;<br >&#39;;    require(&#39;./&#39; . $c . &#39;.php&#39;);
}$lisi = new HumanModel();$lisi->t();// 我先自动加载./HumanModel.php// 人类function test() {
    // 函数内可以写任何合法的PHP代码，包含再声明一个函数/类
    class Bird {
        public static function sing() {
            echo &#39;百灵鸟放声歌唱！<br >&#39;;
        }
    }
}// 必须要调用函数然后才能执行内部test();
Bird::sing(); 


/*
Bird::sing(); 

未定义类
转到上面类的自动加载函数中，于是报错如下：
Warning: require(./Bird.php): failed to open stream: No such file or directory
找不到Bird这个php
*/

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// ===Notes Part 2===

Can automatic loading only use the __autoload function?
Answer: No, in fact, you can also specify a function.

For example, use the zidongjiazai() function

Note: We need to notify the system that we have written an automatic loading method

Use the system function spl_autoload_register to notify
*/

spl_autoload_register(&#39;zidongjiazai&#39;);function zidongjiazai($c) {
    require(&#39;./&#39; . $c . &#39;.php&#39;);
}$HumanModel = new HumanModel();$HumanModel->t();

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// Tips: We can also register a static method of the class to use as the automatic loading function

First write a HumanModel.php

class HumanModel {
    public function t() {
        echo &#39;人类<br >&#39;;
    }
}

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// =Example= //

require(&#39;./HumanModel.php&#39;);$lisi = new HumanModel();$lisi->t(); // 人类

Copy after login

// =Automatic loading of classes= //

function __autoload($c) {
    echo &#39;~~~~~~~~~&#39;,$c,&#39;~~~~~~~~&#39;;
}$ming = new Dog();

Copy after login

// ===Notes Part 1===

Automatic loading of classes

If a non-existent class is called,

Before reporting an error, we can also use the __autoload function
Get an intervention opportunity

The system will call the __autoload() function

and automatically pass the "class name" to the __autoload function

We can load the needs in __autoload Class

function __autoload($c) {
    echo &#39;我先自动加载&#39;;    echo &#39;./&#39; . $c . &#39;.php&#39;;    echo &#39;<br >&#39;;    require(&#39;./&#39; . $c . &#39;.php&#39;);
}$lisi = new HumanModel();$lisi->t();// 我先自动加载./HumanModel.php// 人类function test() {
    // 函数内可以写任何合法的PHP代码，包含再声明一个函数/类
    class Bird {
        public static function sing() {
            echo &#39;百灵鸟放声歌唱！<br >&#39;;
        }
    }
}// 必须要调用函数然后才能执行内部test();
Bird::sing(); 


/*
Bird::sing(); 

未定义类
转到上面类的自动加载函数中，于是报错如下：
Warning: require(./Bird.php): failed to open stream: No such file or directory
找不到Bird这个php
*/

Copy after login

// ===Notes Part 2===

Can automatic loading only use the __autoload function?
Answer: No, in fact, you can also specify a function.

For example, use the zidongjiazai() function

Note: We need to notify the system that we have written an automatic loading method

Use the system function spl_autoload_register to notify
*/

spl_autoload_register(&#39;zidongjiazai&#39;);function zidongjiazai($c) {
    require(&#39;./&#39; . $c . &#39;.php&#39;);
}$HumanModel = new HumanModel();$HumanModel->t();

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// Tips: We can also register a static method of the class to act as an automatic loading function

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PHP’s abstract class

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