Determine execution time in PHP

This code is based on the ASP script posted by Lio. It will determine the time taken for a php script to execute correct to 0.000000000000001 seconds.

<!-- put this at the top of the page -->
<?php
   $mtime = microtime();
   $mtime = explode(" ",$mtime);
   $mtime = $mtime[1] + $mtime[0];
   $starttime = $mtime;
;?>

<!-- put other code and html in here -->


<!-- put this code at the bottom of the page -->
<?php
   $mtime = microtime();
   $mtime = explode(" ",$mtime);
   $mtime = $mtime[1] + $mtime[0];
   $endtime = $mtime;
   $totaltime = ($endtime - $starttime);
   echo "This page was created in ".$totaltime." seconds";
;?>

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