Analysis of Interceptor Usage in php Class

This article illustrates the use of various interceptors in the php class. Share it for your reference. The specific usage analysis is as follows:

1. Called when __get ($property) accesses an undefined property

class lanjie  

{  

    function __get($name)  

    {  

        echo $name." property not found! ";  

    }  

} 
$ob = new lanjie();  

echo $ob->g;

When we call the undefined property g of the object $ob, we call the interceptor __get () method and output "g property not found!";

2. __set ($property, $value) assigns a value to an undefined property when it is called

class person  

{  

    private $_age;  

    private $_name;  

    function __set($name, $value)  

    {  

        $method = "set".  ucfirst($name);  

        echo $method;  

        if(method_exists($this, $method) )  

        {  

            return $this->$method( $value );  

        }  

    }  

      

    function setName( $name )  

    {  

        $this->_name = $name;  

        if( !is_null($this->_name) )  

        {  

            $this->_name = strtoupper($this->_name);  

        }  

    }  

    function setAge( $age )  

    {  

        return $this->_age = (int)$age;  

    }  

}  

  

$p = new person();  

$p->name = 'bob';  

print_r( array( $p ) );

Here we can clearly see that "__set ()" is called when assigning a value to an undefined 'name'

Others are __call (), __isset (), __unset ();
The most useful and commonly used here is __call (), which is called when a method is called; __isset () is called when using the isset () function for a defined attribute, and __unset is called when using unset for an undefined number

I hope this article is helpful to everyone's PHP programming.