spl_autoload_call

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

spl_autoload_call — 尝试调用所有已注册的 __autoload() 函数来装载请求类

说明

spl_autoload_call ( string $class_name ) : void

可以直接在程序中手动调用此函数来使用所有已注册的 __autoload 函数装载类或接口。

参数

class_name: 搜索的类名。

返回值

没有返回值。

User Contributed Notes

Melnofil 15-Apr-2021 10:23


A complete example with namespaces:



fruits/pinapple.php



<?php

namespace Fruits;

echo "pinapple\n";

class Pinapple { }

?>



fruits/pinapple.php



<?php

namespace Vegetables;

use Fruits\Pinapple;

echo "carrot\n";

class Carrot { }

new Pinapple(); // Let's call autoload here

?>



index.php



<?php

spl_autoload_register(function($class_name) {

    @include_once(__DIR__ . '/' . strtolower(str_replace('\\', '/', $class_name)) . '.php');

});

new Vegetables\Carrot();

?>



Result:



carrot

pinapple



index2.php



<?php

spl_autoload_register(function($class_name) {

    @include_once(__DIR__ . '/' . strtolower(str_replace('\\', '/', $class_name)) . '.php');

});

spl_autoload_call('Fruits\\Pinapple'); // Reverse the load order

spl_autoload_call('Fruits\\Pinapple'); // Multiple call is safe with include_once

new Vegetables\Carrot();

?>



Result:



pinapple

carrot

k dot varmark at gmail dot com 02-Feb-2011 03:40


It should be noted, that calling spl_autoload_call on a child class, and then on its parent class, throws a fatal error.



This happens because autoloading the child class also loads the class it extends. And since spl_autoload_call forcibly calls the registered autoload function(s), not taking into account whether the class exists, a fatal error is thrown:



File: child.class.php



<?php

class Child extends Parent () {

    public function __construct () {

        parent::__construct();

    }

}

?>



File: parent.class.php



<?php

class Parent () {

    public function __construct () {



    }

}

?>



File: autoload.php



<?php



/*    works fine    */

    spl_autoload_call('Child');



/*    throws: Fatal error: Cannot redeclare class Parent in /parent.class.php on line 2    */

    spl_autoload_call('Parent');



?>