<?php  $t = new executeTime;  phpinfo();  class executeTime{      private $microtime;      public function __construct(){          $this->microtime = microtime(true);      }          public function getNow(){                  $this->__dectruct();          }      public function __destruct(){          if (empty($_SERVER['REQUEST_TIME_FLOAT']))              echo '<div style="color:#fff;background:#000;position:absolute;top:0px;right:0px;padding:3px 6px;">本次执行时间：', microtime(TRUE) - $this->microtime, '秒</div>';          else              echo '<div style="color:#fff;background:#000;position:absolute;top:0px;right:0px;padding:3px 6px;">本次执行时间：', microtime(TRUE) - $_SERVER['REQUEST_TIME_FLOAT'], '秒</div>';      }  }