如何在第n次出现needle时在PHP中拆分字符串? [英] How to split a string in PHP at nth occurrence of needle?

问题描述

必须有一种快速有效的方法来在第n个"针头出现时拆分(文本)字符串，但是我找不到它. PHP手册中的 strpos注释中有相当完整的功能，但这似乎有点满足我的需求.

There must be a fast and efficient way to split a (text) string at the "nth" occurrence of a needle, but I cannot find it. There is a fairly full set of functions in the strpos comments in the PHP manual, but that seems a bit much for what I need.

我的纯文本为$string，并且想在>的 n 次出现时将其拆分，在我的情况下，needle只是一个空格. (我可以进行健全性检查！)

I have plain text as $string, and want to split it at nth occurrence of $needle, and in my case, needle is simply a space. (I can do the sanity checks!)

有人可以指出我正确的方向吗?非常感谢！

Can someone point me in the right direction? Many thanks!

推荐答案

可能是?

function split2($string,$needle,$nth){
$max = strlen($string);
$n = 0;
for($i=0;$i<$max;$i++){
    if($string[$i]==$needle){
        $n++;
        if($n>=$nth){
            break;
        }
    }
}
$arr[] = substr($string,0,$i);
$arr[] = substr($string,$i+1,$max);

return $arr;
}

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