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<?php
class Timer {
 static $time=array();
 public function set($n='0') {
 list($msec, $sec) = explode(chr(32), microtime());
 self::$time[$n]=$msec+$sec;
 }
 public function get($n='0') {
 list($msec, $sec) = explode(chr(32), microtime());
 $now=$msec+$sec;
 return round($now-self::$time[$n], 12)."<br/>";
 }
 }
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