class Person { private $name; public function set_name($name) { $this->name = $name; } public function get_name() { return $this->name; } } class Worker extends Person { private $salary; public function set_salary($salary) { $this->salary = $salary; } public function get_salary() { return $this->salary; } } $a_work = new Worker(); $a_work->set_name('Paul'); $a_work->set_salary(3500); $name = $a_work->get_name(); $salary = $a_work->get_salary(); echo $name . "µÄÔÂнΪ" . $salary;