phpBB España Oficial

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/**
* Validate hex colour value
*
* @param string $colour The hex colour value
* @param bool $optional Whether the colour value is optional. True if an empty
*                       string will be accepted as correct input, false if not.
* @return bool|string Error message if colour value is incorrect, false if it
*                       fits the hex colour code
*/
function phpbb_validate_hex_colour($colour, $optional = false)
{
        if ($colour === '')
        {
                return (($optional) ? false : 'WRONG_DATA');
        }
 
        if (!preg_match('/^([0-9a-fA-F]{6}|[0-9a-fA-F]{3})$/', $colour))
        {
                return 'WRONG_DATA';
        }
 
        return false;
}