PHP 將datetime類型分割

$datetime = '2014-01-07 12:34:56';
$datetime1 = explode(' ', $datetime);
$date = explode('-', $datetime1[0]);
$year = $date[0];
$month = $date[1];
$day = $date[2];

//上面好像很多行
//使用正則表達式一行就好了，而其實我都不會正則表達式
list($year, $month, $day, $hour, $minute, $second) = preg_split('/[-: ]/', $datetime);
var_dump($year, $month, $day, $hour, $minute, $second);