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');
?>
spl_autoload_call
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
spl_autoload_call — 尝试所有已注册的 __autoload() 函数来装载请求类
参数
-
class -
搜索的类名。
返回值
没有返回值。
add a note
User Contributed Notes 2 notes
k dot varmark at gmail dot com ¶
13 years ago
Melnofil ¶
3 years ago
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
