<?phpclass Person { private $name; private $age; private $id; function __construct( $name, $age ) { $this->name = $name; $this->age = $age; } function setId( $id ) { $this->id = $id; } function getId(){ echo $this->id; } function __clone() { $this->id = 0; }}$p = new Person("A",10); call_user_func( array( $p, 'setId' ), 20 );$p->getId();?>