PHP $this Pointer usage examples

a special method name, "Clone ()", is defined in the PHP5Object The method that is called automatically when cloning, with the "Clone ()" method will establish a same as the original objectProperties and Methods object, if you want to change the contents of the original object after cloning, you need to override the original property and method in Clone (), the "Clone ()" method can have no parameters, it automatically contains $this and $that two pointers, $this point to the replica, and $that point to the original, The concrete examples are as follows:

<?phpclass person {    ///Below is a member of the human attribute    var $name;//person's name    var $sex;//Gender    var $age;//person's age              //define a constructor method Parameters for attribute name $name, gender $sex, and age $age are assigned              //function construct ($name = "", $sex = "", $age = "")    function construct ($name, $ Sex, $age) {        $this->name = $name;        $this->sex = $sex;        $this->age = $age;    }    This person can speak in a way that speaks his own attribute    function say () {        echo "My name is:". $this->name. "Gender:". $this->sex. "My Age is:". $this        ->age. "<br>";    }    The method that is called automatically when the object is cloned, and if you want to change the contents of the original object after cloning, you need to override the original properties and Methods in Clone (). The    function clone () {        //$this refers to the replica P2, while $that is pointing to the original P1, so that in this method, the properties of the replica are changed.        $this->name = "I am a copy of Zhang San $that->name";        $this->age =;    }} $p 1 = new Person ("Zhang San", "male"), $p 2 = clone $p 1; $p 1->say (); $p 2->say (); >

The result of the successful operation of this PHP program is as follows:

My name is: Zhang San Sex: Male my age is:
My name is: I am copy of Zhang San Sex: Male my age is: