<?phpclass test{  public $x=1;  public $setting;  //負(fù)責(zé)生成其他對(duì)象的類或方法,這就是工廠模式  public function getSetting(){    if(!$this->setting){      $this->setting=new Setting();    }    return $this->setting;  }}class Setting{  public function __construct(){    echo 1111;  }}$test=new test();$setting=$test->getSetting();$setting2=$test->getSetting();  //判斷兩個(gè)對(duì)象是否是同一個(gè)對(duì)象var_dump($setting===$setting2);//看編號(hào),也能看出來(lái)var_dump($setting);var_dump($setting2);    //屬性中有減號(hào)的處理$name="x-b";$test->$name=2; var_dump($test);  //$test->x-b;//直接使用上面的屬性,會(huì)被認(rèn)為是一個(gè)減號(hào)/*報(bào)錯(cuò):PHP Notice: Use of undefined constant b - assumed 'b' in D:/phpServer/WWW/test/test.php on line 11 Notice: Use of undefined constant b - assumed 'b' in D:/phpServer/WWW/test/test.php on line 11 */ echo $test->{'x-b'}; //這種屬性里面有-的這樣包一下