public function calculateServiceResolutionTime($identifier)
    {
        $before = microtime(true);
        $this->resolveService($identifier);
        return number_format((microtime(true) - $before) * 1000, 3);
    }
public function calculateServiceResolutionTime($identifier)
    {
        $before = microtime(true);
        $this->resolveService($identifier);
        return number_format((microtime(true) - $before) * 1000, 3);
    }
public function calculateServiceResolutionTime ( $ identifier ) { $ before = microtime ( true ) ; $ this -> resolveService ( $ identifier ) ; return number_format ( ( microtime ( true ) - $ before ) * 1000 , 3 ) ; }
Calculate the time to resolve a service in microseconds.

@param  string $identifier
@return string
Calculate the time to resolve a service in microseconds .