function DMStoDD($latlng) {
    $valid = false;
    $decimal_degrees = 0;
    $degrees = 0; $minutes = 0; $seconds = 0; $direction = 1;
    // Determine if there are extra periods in the input string
	$num_periods = substr_count($latlng, '.');

    if ($num_periods > 1) {
        $temp = preg_replace('/\./', ' ', $latlng, $num_periods - 1); // replace all but last period with delimiter
        $temp = trim(preg_replace('/[a-zA-Z]/','',$temp)); // when counting chunks we only want numbers
		$chunk_count = count(explode(' ',$temp));

        if ($chunk_count > 2) {
            $latlng = preg_replace('/\./', ' ', $latlng, $num_periods - 1); // remove last period
        } else {
            $latlng = str_replace('.', ' ',$latlng); // remove all periods, not enough chunks left by keeping last one
        }
    }

    // Remove unneeded characters
    $latlng = trim($latlng);
    $latlng = str_replace('º', ' ',$latlng);
    $latlng = str_replace('°', ' ',$latlng);
    $latlng = str_replace('\'', ' ',$latlng);
    $latlng = str_replace('"', ' ',$latlng);
    $latlng = str_replace('  ', ' ',$latlng);
	$latlng = substr($latlng, 0, 1) . str_replace('-', ' ', substr($latlng, 1)); // remove all but first dash

    if ($latlng != '') {
    	// DMS with the direction at the start of the string
        if (preg_match("/^([nsewNSEW]?)\s*(\d{1,3})\s+(\d{1,3})\s+(\d+\.?\d*)$/",$latlng,$matches)) {
            $valid = true;
            $degrees = intval($matches[2]);
            $minutes = intval($matches[3]);
            $seconds = floatval($matches[4]);
            if (strtoupper($matches[1]) == 'S' || strtoupper($matches[1]) == 'W')
                $direction = -1;
        }
        // DMS with the direction at the end of the string
        else if (preg_match("/^(-?\d{1,3})\s+(\d{1,3})\s+(\d+(?:\.\d+)?)\s*([nsewNSEW]?)$/",$latlng,$matches)) {
            $valid = true;
            $degrees = intval($matches[1]);
            $minutes = intval($matches[2]);
            $seconds = floatval($matches[3]);
            if (strtoupper($matches[4]) == 'S' || strtoupper($matches[4]) == 'W' || $degrees < 0) {
                $direction = -1;
                $degrees = abs($degrees);
            }
        }
        if ($valid) {
            // A match was found, do the calculation
            $decimal_degrees = ($degrees + ($minutes / 60) + ($seconds / 3600)) * $direction;
        } else {
            // Decimal degrees with a direction at the start of the string
            if (preg_match("/^([nsewNSEW]?)\s*(\d+(?:\.\d+)?)$/",$latlng,$matches)) {
                $valid = true;
                if (strtoupper($matches[1]) == 'S' || strtoupper($matches[1]) == 'W')
                    $direction = -1;
                $decimal_degrees = $matches[2] * $direction;
            }
            // Decimal degrees with a direction at the end of the string
            elseif (preg_match("/^(-?\d+(?:\.\d+)?)\s*([nsewNSEW]?)$/",$latlng,$matches)) {
                $valid = true;
                if (strtoupper($matches[2]) == 'S' || strtoupper($matches[2]) == 'W' || $degrees < 0) {
                    $direction = -1;
                    $degrees = abs($degrees);
                }
                $decimal_degrees = $matches[1] * $direction;
            }
        }
	}

	return $valid ? $decimal_degrees : false;
}