php - mysql：每N个字符添加逗号

Question

$string= 2013-01-0112:00:002013-01-0212:00:002013-01-0312:00:00

我想得到

$nexstring= 2013-01-0112:00:00,2013-01-0212:00:00,2013-01-0312:00:00//comma each 18 chars

Answer 1

使用str_split：

$chunks = str_split($string, 18);

$nexstring = join(',', $chunks);

Answer 2

$nextString = implode(
    ',',
    str_split($string, 18)
);

Answer 3

我认为您可以使用自动换行功能，而不是拆分字符串。

$nexstring = wordwrap($nexstring, 18, ',', true);