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PHP. Руководство по PHP. 2005

Autoloading ObjectsПред.Глава 19. Классы и объекты (PHP 5)След.

Autoloading Objects

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 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.

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

Пример 19-5. 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(); 

?>

Пред. Начало След.

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