public function userAgent( $user_agent )
	{
		if ( strpos( $user_agent, "Firefox/" ) !== false ) {
			$browser = "Firefox";
		} elseif ( strpos( $user_agent, "Opera/" ) !== false || strpos( $user_agent, 'OPR/' ) !== false ) {
			$browser = "Opera";
		} elseif ( strpos( $user_agent, "YaBrowser/" ) !== false ) {
			$browser = "Yandex";
		} elseif ( strpos( $user_agent, "Chrome/" ) !== false ) {
			$browser = "Chrome";
		} elseif ( strpos( $user_agent, "MSIE/" ) !== false || strpos( $user_agent, 'Trident/' ) !== false ) {
			$browser = "Internet Explorer";
		} elseif ( strpos( $user_agent, "Safari/" ) !== false ) {
			$browser = "Safari";
		} else {
			$browser = "Undefined";
		}

		return $browser;
	}
public function userAgent( $user_agent )
	{
		if ( strpos( $user_agent, "Firefox/" ) !== false ) {
			$browser = "Firefox";
		} elseif ( strpos( $user_agent, "Opera/" ) !== false || strpos( $user_agent, 'OPR/' ) !== false ) {
			$browser = "Opera";
		} elseif ( strpos( $user_agent, "YaBrowser/" ) !== false ) {
			$browser = "Yandex";
		} elseif ( strpos( $user_agent, "Chrome/" ) !== false ) {
			$browser = "Chrome";
		} elseif ( strpos( $user_agent, "MSIE/" ) !== false || strpos( $user_agent, 'Trident/' ) !== false ) {
			$browser = "Internet Explorer";
		} elseif ( strpos( $user_agent, "Safari/" ) !== false ) {
			$browser = "Safari";
		} else {
			$browser = "Undefined";
		}

		return $browser;
	}
@param $user_agent

@return string