$code = 'code';
$patt = "/^[1-9]d{5}(19|20)d{2}((0[1-9])|(10|11|12))([012](d|(30|31)))d{3}[xXd]$/";
preg_match_all($patt, $code, $match);
if(!empty($match[0])){
echo '成功';
} else {
echo'失败';
}