How to use __call() in PHP-PHP Tutorial-php.cn

How to use __call() in PHP

墨辰丷

Release： 2023-03-25 18:14:02

Original

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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&#39;m $name!");  
  }  
} $x = new foo();  
$x->doStuff();  
$x->fancy_stuff();  
?>

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2. Use __call to implement the "overload" action

<?php  
class Magic {  
  function __call($name,$arguments) {  
    if($name==&#39;foo&#39;) {  
  if(is_int($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");  
?>

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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 &#39;$name&#39; ");  
}  
  
}  
}  
  
class User extends Obj  
{  
public function show()  
{  
print ("Username: ".$this->property[&#39;Username&#39;]."<br>;");  
//print ("Username: ".$this->getUsername()."<br>;");  
print ("Sex: ".$this->property[&#39;Sex&#39;]."<br>;");  
print ("Age: ".$this->property[&#39;Age&#39;]."<br>;");  
}  
}  
  
class Car extends Obj  
{  
public function show()  
{  
print ("Model: ".$this->property[&#39;Model&#39;]."<br>;");  
print ("Sum: ".$this->property[&#39;Number&#39;] * $this ->property[&#39;Price&#39;]."<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();  
?>

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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.

Related recommendations:

How to use __call() and __callStatic() in PHP

How to use the __call() method in php and overload instance analysis

php’s magic methods __get(), __set(), __call(), __callStatic() and static Detailed explanation of usage

Detailed explanation of magic method __call() instance (php advanced object-oriented tutorial)

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