PHP calculate page execution time

I wrote a script to calculate the page execution time
The execution time will be displayed in the upper right corner of the page
The advantage is that you only need to execute it at the beginning

$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;">This execution time:', microtime(TRUE) - $this-> ;microtime, 'seconds

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