public function check($key)
    {
        if (isset($this->timers[$key])) {
            return round((microtime(true) - $this->timers[$key]) * 1000, 2);
        }
    }
public function check($key)
    {
        if (isset($this->timers[$key])) {
            return round((microtime(true) - $this->timers[$key]) * 1000, 2);
        }
    }
public function check ( $ key ) { if ( isset ( $ this -> timers [ $ key ] ) ) { return round ( ( microtime ( true ) - $ this -> timers [ $ key ] ) * 1000 , 2 ) ; } }
Check a given timer and get the elapsed time in milliseconds.

@param  string  $key
@return float|null
Check a given timer and get the elapsed time in milliseconds .