GPS Coordinates Parser

GpsParser.php

<?php

/**
 * GPS Coordinates Parser
 * 
 * Forms:
 * - 49.7175669N, 15.3728881E
 * - N 49°43.05402', E 15°22.37328'
 * - 49°43'3.241"N, 15°22'22.397"E
 * - N48.7382° E19.56845°
 * - N48°44.292' E19°34.107'
 * - 50.068651, 14.475237
 *
 * @author Milan Felix Sulc <[email protected]>
 * @copyright WebToad s.r.o. <[email protected]>
 */
final class Parser
{

    /**
     * @param mixed $lonlat
     * @return array
     */
    public static function parse($lonlat)
    {
        // Strip E,N
        $lonlat = str_replace(['E', 'N'], NULL, $lonlat);

        // Strip spaces and whitespaces
        $lonlat = str_replace([' ', '#\s+#'], '', $lonlat);

        // XX.XX, YY.YY
        if (preg_match('#^(\d+\.\d*)[,\s]*(\d+\.\d*)$#is', $lonlat, $matches)) {
            list (, $lat, $lng) = $matches;

            return [
                // Latitude
                floatval($lat),
                // Longitude
                floatval($lng),
            ];
        }

        // XX°XX.X'[XX.XXXX"], YY°YY.Y'[YY.YYY"]
        if (preg_match_all('#^(.*)[,\s]+(.*)$#', $lonlat, $matches)) {
            list(, $lat, $lng) = $matches;

            return [
                // Latitude
                self::toDec(array_shift($lat)),
                // Longitude
                self::toDec(array_shift($lng)),
            ];
        }

        return NULL;
    }

    /**
     * @param mixed $coordinate
     * @return float
     */
    private static function toDec($coordinate)
    {
        if (preg_match_all('#(\d+\.?\d*)#', $coordinate, $matches)) {
            $match = array_shift($matches);

            $degrees = floatval($match[0]);
            $minutes = floatval(isset($match[1]) ? $match[1] : 0);
            $seconds = floatval(isset($match[2]) ? $match[2] : 0);

            // Do math
            $degrees = $degrees + ($minutes / 60) + ($seconds / 60 / 60);

            // Round to 6 decimals
            $degrees = round($degrees, 6);

            return floatval($degrees);
        } else {
            return $coordinate;
        }
    }
}