PHP Magic Methods __sleep () and __wakeup ()

The use of Magic methods

<?phpclass Connection {    protected  $link;     private  $server,  $username,  $password,  $db;         public function __construct ($server,  $username,  $password,  $db)      {         $this->server =  $server;          $this->username =  $username;          $this->password =  $password;         $ this->db =  $db;         $this->connect ();     }        private function connect ()      {         $this->link = mysql_connect ($this- >server,  $this->username,  $this->password);         mysql_select_db ($this->db,   $this->link);    }        public  Function __sleep ()     {        echo __ Method__;        return array (' server ',  ' username ',  ' Password ',  ' db ')  //save these properties when serializing     }         public function __wakeup ()     {          $this->connect ();  //automatically connect to the database after deserialization         echo __ METHOD__;&NBSP;&NBSP;&NBSP;&NBSP}} $conn  = connection (' mysql://localhost:3306/', ' root ', ' root123 ', ' db ' _php '); Unserilize (serialize ($conn));? >

Output

__sleep__wakeup

PHP Magic Methods __sleep () and __wakeup ()