Execution time use microtime

จาก Wiki2

<?php
   $mtime = microtime();
   echo $mtime."<br/>";
   
   $mtime = explode(" ",$mtime);
   $mtime = $mtime[1] + $mtime[0];
   $starttime = $mtime;
   echo $starttime."<br/>";
   usleep(100000);
   $mtime = microtime();
      echo $mtime."<br/>";
   $mtime = explode(" ",$mtime);
   $mtime = $mtime[1] + $mtime[0];
   $endtime = $mtime;
   echo $endtime."<br/>";
   $totaltime = ($endtime - $starttime);
   echo "This page was created in ".$totaltime." seconds";  
    
?>