Object property and method call overloadingObject overloading
&reftitle.intro;
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.
&warn.experimental;
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.
&reftitle.required;
&no.requirement;
&reference.overload.configure;
&reftitle.runtime;
&no.config;
&reftitle.resources;
&no.resource;
&reftitle.constants;
&no.constants;
&reftitle.examples;
Some simple examples on using the overload
function:
Overloading a PHP class
9, 'c' => 42);
// Callback method for getting a property
function __get($prop_name, &$prop_value)
{
if (isset($this->elem[$prop_name])) {
$prop_value = $this->elem[$prop_name];
return true;
} else {
return false;
}
}
// Callback method for setting a property
function __set($prop_name, $prop_value)
{
$this->elem[$prop_name] = $prop_value;
return true;
}
}
// Here we overload the OO object
overload('OO');
$o = new OO;
echo "\$o->a: $o->a\n"; // print: $o->a: 111
echo "\$o->b: $o->b\n"; // print: $o->b: 9
echo "\$o->c: $o->c\n"; // print: $o->c: 42
echo "\$o->d: $o->d\n"; // print: $o->d:
// add a new item to the $elem array in OO
$o->x = 56;
// instantiate stdclass (it is built-in in PHP 4)
// $val is not overloaded!
$val = new stdclass;
$val->prop = 555;
// Set "a" to be an array with the $val object in it
// But __set() will put this in the $elem array
$o->a = array($val);
var_dump($o->a[0]->prop);
?>
]]>
&reference.overload.functions;