php时间转换问题

Question

$date = preg_replace("/(\d{4})(\d{2})(\d{2})(\d{2})/", "$1-$2-$3-$4", $str);

Answer 1

$date = preg_replace("/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/", "$1-$2-$3-$4-$5-$6", $str);

Answer 2

告诉你一个最笨方法就是截取字符：
<?php
$time = "20080422120021";
$str1 = substr($time,0,4);
$str2 = substr($time,4,2);
$str3 = substr($time,6,2);
$str4 = substr($time,8,2);
$str5 = substr($time,10,2);
$str6 = substr($time,12,2);
echo ($str1."-".$str2."-".$str3." ".$str4."-".$str5."-".$str6);
?>

Answer 3

嗯嗯，以上方法都对，昨天看到一种方法是用
date_format参考
http://www.php.net/manual/en/function.date-format.php