getTimeDiff

function getTimeDiff($timestamp=false, $loop=false) {
 
	$current_time = time();
 
	if ($timestamp) {
 
  		// Determine the difference, between the time now and the timestamp
		$difference = $current_time - $timestamp;
 
   		// Set the periods of time
  		$periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
		$lengths = array(1, 60, 3600, 86400, 604800, 2630880, 31570560, 315705600);
 
   		// Determine which period we should use, based on the number of seconds lapsed.
   		// If the difference divided by the seconds is more than 1, we use that.
		// Eg 1 year / 1 decade = 0.1, so we move on
  	 	// Go from decades backwards to seconds       
   		for ($val = sizeof($lengths) - 1; ($val >= 0) && (($number = $difference / $lengths[$val]) <= 1); $val--);
 
   		// Ensure the script has found a match
   		if ($val < 0) $val = 0;
 
   		// Determine the minor value, to recurse through
   		$new_time = $current_time - ($difference % $lengths[$val]);
 
   		// Set the current value to be floored
   		$number = floor($number);
 
   		// If required create a plural
   		if($number != 1) $periods[$val].= "s";
 
   		// Return text
   		$text = sprintf("%d %s ", $number, $periods[$val]);   
 
   		// Ensure there is still something to recurse through, and we have not found 1 minute and 0 seconds.
		// note: 'the loop' is turned off - it will only show the highest
   		if ($loop && ($val >= 1) && (($current_time - $new_time) > 0)){
       			$text .= getTimeDiff($new_time);
		}
 
   		return $text;
	}
}