字符串 菜鸟问题

Question

有个字符串31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34,0,35,0
现在想把里面的0全都删了，变成31,32,33,16,25,17,18,19,20,21,22,23,24,26,27,28,29,30,34,35 （用php）

Answer 1

$preg = "/(0,)|(,0)/";
$str = "31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34
,0,35,0";echo preg_replace($preg,"",$str);

Answer 2

$str = "31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34
,0,35,0";$str_done = str_replace(",0,",",",",".$str.",");echo substr($str_done, 1, strlen($str_done)-2);

Answer 3

??????
$str = '31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34,0,35,0';
foreach(explode(',',$str) as $v)
{
if($v != 0) $arr[] = $v;
}
echo implode(',',$arr);

Answer 4

$str   =   "31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34,0,35,0";
echo preg_replace("/\b0,|,0\b|,0,/","",$str);

Answer 5

$str   =   "31,0,32,0,33,0,16,0,25,0,17,0,18,0,19,0,20,0,21,0,22,0,23,0,24,0,26,0,27,0,28,0,29,0,30,0,34,0,35,0";
echo preg_replace("/\b0,|,0\b|,0,/","",$str);
请问这句怎么理解？

Answer 6

|  :是或的意思
\b :匹配字符边界，但不消耗字符。详细解释请看http://www.regular-expressions.info/wordboundaries.html

Answer 7

/\b0,|,0\b|,0,/ 可以进一步改成 /\b0,|,0\b/ 
因为前两种情况已经包含了的三种情况，不必多次一举。