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

问题描述

必须有一种快速有效的方法来在第n个"字符串处分割(文本)字符串.发生针头，但我找不到. PHP手册中的 strpos注释中有相当完整的功能，但这似乎满足我的需求.

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，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!)

我该怎么办?

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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