Jesteś w: Autoloading Classes


Autoloading Classes:
Autoloading Classes - Manual in BULGARIAN
Autoloading Classes - Manual in GERMAN
Autoloading Classes - Manual in ENGLISH
Autoloading Classes - Manual in FRENCH
Autoloading Classes - Manual in POLISH
Autoloading Classes - Manual in PORTUGUESE

Ostatnie szukania:
language functions , include functions , variable functions , post functions




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Classes and Objects
PHP Manual

Autoloading Classes

Many developers writing object-oriented applications create one PHP source file per-class definition. One of the biggest annoyances is having to write a long list of needed includes at the beginning of each script (one for each class).

In PHP 5, this is no longer necessary. You may define an __autoload function which is automatically called in case you are trying to use a class/interface which hasn't been defined yet. By calling this function the scripting engine is given a last chance to load the class before PHP fails with an error.

Informacja: Exceptions thrown in __autoload function cannot be caught in the catch block and results in a fatal error.

Informacja: Autoloading is not available if using PHP in CLI interactive mode.

Informacja: If the class name is used e.g. in call_user_func() then it can contain some dangerous characters such as ../. It is recommended to not use the user-input in such functions or at least verify the input in __autoload().

Przykład #1 Autoload example

This example attempts to load the classes MyClass1 and MyClass2 from the files MyClass1.php and MyClass2.php respectively.

<?php
function __autoload($class_name) {
    require_once 
$class_name '.php';
}

$obj  = new MyClass1();
$obj2 = new MyClass2(); 
?>

Przykład #2 Autoload other example

This example attempts to load the interface ITest.

<?php

function __autoload($name) {
    
var_dump($name);
}

class 
Foo implements ITest {
}

/*
string(5) "ITest"

Fatal error: Interface 'ITest' not found in ...
*/
?>

Zobacz też:


Classes and Objects
PHP Manual

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