// First you need to include the functions in the header or something
 
// timer start function
function startTimer() { 
   global $starttime; 
   $mtime = microtime (); 
   $mtime = explode (' ', $mtime); 
   $mtime = $mtime[1] + $mtime[0]; 
   $starttime = $mtime; 
} 
 
// timer end function
function endTimer() { 
   global $starttime; 
   $mtime = microtime (); 
   $mtime = explode (' ', $mtime); 
   $mtime = $mtime[1] + $mtime[0]; 
   $endtime = $mtime; 
   $totaltime = round (($endtime - $starttime), 5); 
   return $totaltime; 
} 
 
// now at the start of your header usually immediatly after these 
// functions. start the timer with...
startTimer();
 
// all you do now is output it on your page somewhere using this
Page Generation time: <?=endTimer();?>