| = This is haohappy read < > | = Notes in Classes and objects Chapter | = Translation-based + personal experience | = Please do not reprint in order to avoid the unnecessary trouble that may occur, thank you | = Welcome criticism, hope and all the PHP enthusiasts to progress together! +-------------------------------------------------------------------------------+ */11th-Heavy Duty PHP4 already has overloaded syntax to build mappings to the external object model, just like Java and COM. PHP5 brings a powerful object-oriented overload that allows programmers to create custom behaviors to access properties and invoke methods. Overloading can be done through __get, __set, and __call several special methods. PHP will call these methods when the Zend engine tries to access a member and does not find it. In example 6.14, __get and __set Replace all access to an array of attribute variables. If necessary, you can implement any type of filter you want. For example, a script can prohibit setting a property value, starting with a certain prefix or containing a certain type of value. The __call method shows you how to invoke an undefined method. When you call an undefined method, the method name and the parameter received by the method are passed to the __call method, and the value of the PHP pass __call is returned to the undefined method. Listing 6.14 User-level Overloading properties[$property _name]) {return ($this->properties[$property _name]);} else {return (NULL);}} function __set ($property _name, $value) {$this->properties[$property _name] = $value;} function __call ($function _ Name, $args) {print ("invoking $function _name ()
n "); Print ("Arguments:"); Print_r ($args); return (TRUE); }} $o = new Overloader (); Invoke __set () assigns a value to a non-existent property variable, activates __set () $o->dynaprop = "Dynamic Content"; Invoke __get () activates __get () print ($o->dynaprop. "
n "); Invoke __call () activates __call () $o->dynamethod ("Leon", "Zeev");?>
http://www.bkjia.com/PHPjc/532154.html www.bkjia.com true http://www.bkjia.com/PHPjc/532154.html techarticle | = Note for Haohappy read > | = Classes and objects in the Chapter | = translation + personal Experience | = To avoid unnecessary inconvenience that may occur please do not reprint, thank you | = Welcome to criticize ...
