Resources/contao/classes/Utils.php
public static function validateLon($value)
    {
        if (strpos($value, '{{') !== -1) {
            return true;
        }
        if (self::validateGeo($value)) {
            return (($value >= -180.0) && ($value <= 180.0));
        }
        return false;
    }
public static function validateLon($value)
    {
        if (strpos($value, '{{') !== -1) {
            return true;
        }
        if (self::validateGeo($value)) {
            return (($value >= -180.0) && ($value <= 180.0));
        }
        return false;
    }
public static function validateLon ( $ value ) { if ( strpos ( $ value , '{{' ) !== - 1 ) { return true ; } if ( self :: validateGeo ( $ value ) ) { return ( ( $ value >= - 180.0 ) && ( $ value <= 180.0 ) ) ; } return false ; }
Validate a longitude coordinate
@param  [type] $value [description]
@return [type]        [description]
Validate a longitude coordinate