// 格式化日期
 static function formatDate($format, $datetime, $week = 0) {
     $datetime = $datetime > 3000 ? $datetime : strtotime($datetime);
     if ($week) {
         $weeknames = [
             '日',
             '一',
             '二',
             '三',
             '四',
             '五',
             '六'
         ];
         $format = str_replace('w', $weeknames [date('w', $datetime)], $format);
     }
     return date($format, $datetime);
 }

echo "周" . formatDate("w","2012-11-03 00:46:22" , 1) . " " . formatDate("Y-m-d", "2012-11-03 00:46:22");
echo "周" . formatDate("w","1388678400" , 1) . " " . formatDate("Y-m-d", "1388678400");

周六 2012-11-03
周五 2014-01-03