PHP--Magic Method Delete attribute: __unset ()

Property overloading: When accessing a property that does not exist or has insufficient permissions, it can trigger a series of magic methods called Property overloading

__unset (): Automatically triggers when a property that does not exist or has insufficient permissions is deleted

<?PHP//Property Overloading    classperson{//Properties         Public $name; Private $age; //Construction Method         Public function__construct ($name,$age) {            $this->name =$name; $this->age =$age; }        //Add __unset method, no return value         Public function__unset ($name){            $allow=Array(' Age '); //Judging            if(In_array($name,$allow)){            //If delete is allowed, help it remove                unset($this-$name); }        }    }    Echo' <pre> '; //instantiation of    $person=NewPerson (' Yuanshenfangzhi ', 19); Var_dump($person); //Delete attribute//unset ($person->name);    The public attribute can be directly unset off//var_dump ($person); Unset Private Properties    unset($person-Age ); Var_dump($person); unset($person->tail);

PHP--Magic Method Delete attribute: __unset ()