<?php header('Content-Type:text/html;charset=utf-8'); /* static的应用 静态属性和静态方法:属性或方法前面加一个static */ class Human { public static $header = 1; public function changehead() { self::$header = 9; } public function getheader() { return self::$header; } } echo Human::$header; //用来读取类中(不是对象)的属性和方法 $m1 = new Human(); $m1->changehead(); $m2 = new Human(); $m3 = new Human(); echo $m2->getheader(); echo $m3->getheader();