Section 11--Reloading_PHP Tutorial-PHP Tutorial-php.cn

Section 11--Reloading_PHP Tutorial

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Release： 2016-07-21 16:01:06

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Section 11--Overloading
There is already overloading syntax in PHP4 to create Mapping of external object models, just like Java and COM. PHP5 brings powerful object-oriented overloading, allowing programmers to build custom behaviors to access properties and call methods.
Overloading can be done through __get, __set, and __call are several special methods. When the Zend engine tries to access a member and cannot find it, PHP will call these methods.
In Example 6.14, __get and __set replace all accesses to the attribute variable array . If necessary, you can implement any type of filtering you want. For example, the script can disable setting property values, start with a certain prefix or include a certain type of value. The
__call method illustrates how you can call a property without Defined method. When you call an undefined method, the method name and the parameters received by the method will be passed to the __call method, and PHP returns the value of __call to the undefined method.
Listing 6.14 User-level overloading

Copy code The code is as follows:

class Overloader
{
private $properties = array();
function __get($property_name)
{ Return($this->properties[$property_name ]); $this->properties[$property_name] = $value; gt;n ");
print("Arguments: ");
print_r($args);
return(TRUE);
} }
}
$o = new Overloader();
//invoke __set() Assigns a value to a non-existent attribute variable and activates __set()
$o->dynaProp = "Dynamic Content";
//invoke __get() Activates __get ()
print($o->dynaProp . "
n");
//invoke __call() Activate __call()
$o->dynaMethod("Leon" , "Zeev");
?>