International PHP Conference 2015

spl_autoload_register

(PHP 5 >= 5.1.2)

spl_autoload_registerRegister given function as __autoload() implementation

Descrizione

bool spl_autoload_register ([ callable $autoload_function [, bool $throw = true [, bool $prepend = false ]]] )

Register a function with the spl provided __autoload queue. If the queue is not yet activated it will be activated.

If your code has an existing __autoload() function then this function must be explicitly registered on the __autoload queue. This is because spl_autoload_register() will effectively replace the engine cache for the __autoload() function by either spl_autoload() or spl_autoload_call().

If there must be multiple autoload functions, spl_autoload_register() allows for this. It effectively creates a queue of autoload functions, and runs through each of them in the order they are defined. By contrast, __autoload() may only be defined once.

Elenco dei parametri

autoload_function

The autoload function being registered. If no parameter is provided, then the default implementation of spl_autoload() will be registered.

throw

This parameter specifies whether spl_autoload_register() should throw exceptions when the autoload_function cannot be registered.

prepend

If true, spl_autoload_register() will prepend the autoloader on the autoload queue instead of appending it.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Log delle modifiche

Versione Descrizione
5.3.0 Namespaces support was introduced.
5.3.0 The prepend parameter was added.

Esempi

Example #1 spl_autoload_register() as a replacement for an __autoload() function

<?php

// function __autoload($class) {
//     include 'classes/' . $class . '.class.php';
// }

function my_autoloader($class) {
    include 
'classes/' $class '.class.php';
}

spl_autoload_register('my_autoloader');

// Or, using an anonymous function as of PHP 5.3.0
spl_autoload_register(function ($class) {
    include 
'classes/' $class '.class.php';
});

?>

Example #2 spl_autoload_register() example where the class is not loaded

<?php

namespace Foobar;

class 
Foo {
    static public function 
test($name) {
        print 
'[['$name .']]';
    }
}

spl_autoload_register(__NAMESPACE__ .'\Foo::test'); // As of PHP 5.3.0

new InexistentClass;

?>

Il precedente esempio visualizzerĂ  qualcosa simile a:

[[Foobar\InexistentClass]]
Fatal error: Class 'Foobar\InexistentClass' not found in ...

Vedere anche:

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