by kevin
11.
十一月 2014 21:10
>
chown命令:
可以用来改变linux文件的所有者,用到这个,是因为交替使用ftp和winscp上传文件,而且使用了不同的用户,导致经常出现上传失败。
css的 line-height:
很多浏览器默认line-height的值是font-size的120%,也有是100%的,所有应该考虑reset一下。
php的日期比较:
过程化方法:date_diff
对象化方法:DateTimeObject->diff
这个没有.net那么舒服,有个TimeSpan,要获取相差多少天,多少秒的,真心麻烦。
直接上代码:
1: public static function datediff($dt_menor, $dt_maior, $str_interval, $relative=false) {
2: if (is_string($dt_menor))
3: $dt_menor = date_create($dt_menor);
4: if (is_string($dt_maior))
5: $dt_maior = date_create($dt_maior);
6:
7: $diff = date_diff($dt_menor, $dt_maior, !$relative);
8:
9: switch ($str_interval) {
10: case "y":
11: $total = $diff->y + $diff->m / 12 + $diff->d / 365.25;
12: break;
13: case "m":
14: $total = $diff->y * 12 + $diff->m + $diff->d / 30 + $diff->h / 24;
15: break;
16: case "d":
17: $total = $diff->y * 365.25 + $diff->m * 30 + $diff->d + $diff->h / 24 + $diff->i / 60;
18: break;
19: case "h":
20: $total = ($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h + $diff->i / 60;
21: break;
22: case "i":
23: $total = (($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h) * 60 + $diff->i + $diff->s / 60;
24: break;
25: case "s":
26: $total = ((($diff->y * 365.25 + $diff->m * 30 + $diff->d) * 24 + $diff->h) * 60 + $diff->i) * 60 + $diff->s;
27: break;
28: }
29: if ($diff->invert)
30: return -1 * $total;
31: else
32: return $total;
33: }