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PHP5 objects have a new dedicated method __call(), which is used to monitor other methods in an object. If you try to call a method on an object that does not exist or is permission-controlled, the __call method will be called automatically.
1. The use of __call
<?php class foo { function __call($name,$arguments) { print("Did you call me? I'm $name!"); } } $x = new foo(); $x->doStuff(); $x->fancy_stuff(); ?>
2. Use __call to implement the "overload" action
<?php class Magic { function __call($name,$arguments) { if($name=='foo') { if(is_int($arguments[0])) $this->foo_for_int($arguments[0]); if(is_string($arguments[0])) $this->foo_for_string($arguments[0]); } } private function foo_for_int($x) { print("oh an int!"); } private function foo_for_string($x) { print("oh a string!"); } } $x = new Magic(); $x->foo(3); $x->foo("3"); ?>
3 The two functions ._call and ___callStatic are the default functions of the PHP class.
__call() In the context of an object, if the called method cannot be accessed, it will be triggered
__callStatic() In a static context, if the called method cannot be accessed, it will be triggered
<?php abstract class Obj { protected $property = array(); abstract protected function show(); public function __call($name,$value) { if(preg_match("/^set([a-z][a-z0-9]+)$/i",$name,$array)) { $this->property[$array[1]] = $value[0]; return; } elseif(preg_match("/^get([a-z][a-z0-9]+)$/i",$name,$array)) { return $this->property[$array[1]]; } else { exit("<br>;Bad function name '$name' "); } } } class User extends Obj { public function show() { print ("Username: ".$this->property['Username']."<br>;"); //print ("Username: ".$this->getUsername()."<br>;"); print ("Sex: ".$this->property['Sex']."<br>;"); print ("Age: ".$this->property['Age']."<br>;"); } } class Car extends Obj { public function show() { print ("Model: ".$this->property['Model']."<br>;"); print ("Sum: ".$this->property['Number'] * $this ->property['Price']."<br>;"); } } $user = new User; $user ->setUsername("Anny"); $user ->setSex("girl"); $user ->setAge(20); $user ->show(); print("<br>;<br>;"); $car = new Car; $car ->setModel("BW600"); $car ->setNumber(5); $car ->setPrice(40000); $car ->show(); ?>
Summary:
The __call() function is the default magic function of the PHP class. __call() is triggered in the context of an object if the called method does not exist.
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How to use __call() and __callStatic() in PHP
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Detailed explanation of magic method __call() instance (php advanced object-oriented tutorial)
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