PHP DateTime接受多种格式？

I'm trying to construct a DateTime object with multiple accepted formats.

According to the DateTime::createFromFormat docs, the first parameter (format) must be a string. I was wondering if there was a way to createFromFormats.

In my case, I want the year for my format to be optional:

DateTime::createFromFormat('Y-m-d', $date);
DateTime::createFromFormat('m-d', $date);

so that a user can input just 'm-d' and the year would be assumed 2013. If I wanted multiple accepted formats, would I have to call createFromFormat each time?

Shortest thing for my scenario is:

DateTime::createFromFormat('m-d', $date) ?: DateTime::createFromFormat('Y-m-d', $date);

You could create your own class that extends DateTime and add your own method:

class EasyDateTime extends DateTime {

    public static function createFromFormat($string){   
        if (count(explode("-", $string)) === 2) {
            $string = date('Y')."-".$string;
        }
        return parent::createFromFormat('Y-m-d',$string);
    }
}

var_dump( EasyDateTime::createFromFormat('01-01') );
// object(DateTime)#1 (3) { ["date"]=> string(19) "2013-01-01 05:11:03" ["timezone_type"]=> int(3) ["timezone"]=> string(11) "Europe/Oslo" }