The purpose of this extension is to allow overloading of object
property access and method calls. Only one function is defined
in this extension, overload() which
takes the name of the class that should have this functionality
enabled. The class named has to define appropriate methods if
it wants to have this functionality: __get(),
__set() and __call()
respectively for getting/setting a property, or calling a method.
This way overloading can be selective. Inside these handler
functions the overloading is disabled so you can access object
properties normally.
警告 |
本扩展模块是实验性的。本模块的行为,包括其函数的名称以及其它任何关于此模块的文档可能会在没有通知的情况下随
PHP 以后的发布而改变。使用本扩展模块风险自担。 |
警告 |
This extension is not a part of PHP 5. PHP 5 supports __get(), __set() and
__call() natively. See the Overloading in PHP 5 page
for more information.
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In order to use these functions, you must compile
PHP with the --enable-overload option.
Starting with PHP 4.3.0 this extension is enabled by default. You can
disable overload support with
--disable--overload.
PHP 的 Windows
版本已经内置该扩展模块的支持。无需加载任何附加扩展库即可使用这些函数。
注:
Builtin support for overload is available with PHP 4.3.0.
本扩展模块在 php.ini 中未定义任何设置指令。
Some simple examples on using the overload()
function:
例子 1. Overloading a PHP class
<?php
class OO {
var $a = 111;
var $elem = array('b' => 9, 'c' => 42);
function __get($prop_name, &$prop_value)
{
if (isset($this->elem[$prop_name])) {
$prop_value = $this->elem[$prop_name];
return true;
} else {
return false;
}
}
function __set($prop_name, $prop_value)
{
$this->elem[$prop_name] = $prop_value;
return true;
}
}
overload('OO');
$o = new OO;
echo "\$o->a: $o->a\n"; echo "\$o->b: $o->b\n"; echo "\$o->c: $o->c\n"; echo "\$o->d: $o->d\n"; $o->x = 56;
$val = new stdclass;
$val->prop = 555;
$o->a = array($val);
var_dump($o->a[0]->prop);
?>
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