PHP的魔法方法

1 public array __sleep(void)2 3 void __wakeup(void)

 1 <?php 2 class Connection{ 3 protected $link; 4 private $server,$username,$password,$db; 5 public function __construct($server,$username,$password,$db) 6 { 7 $this->server=$server; 8 $this->username=$username; 9 $this->password=$password;10 $this->db=$db;11 $this->connect();12 }13 private function connect(){14 $this->link=mysql_connect($this->server,$this->username,$this->password);15 mysql_select_db($this->db,$this->link);16 }17 public function __sleep(){18 return array('server','username','password','db');19 }20 public function __wakeup(){21 $this->connect();22 }23 }