php从第0个位置替换第一次出现的字符串

2021-12-25 00:00:00 string replace php substring

我想在 php 中搜索并替换第一个单词，如下所示:

I want to search and replace the first word with another in php like as follows:

$str="nothing inside";

在不使用substr

输出应该是:'里面的东西'

output should be: 'something inside'

推荐答案

使用 preg_replace() 限制为 1:

Use preg_replace() with a limit of 1:

preg_replace('/nothing/', 'something', $str, 1);

用您要搜索的任何字符串替换正则表达式 /nothing/.由于正则表达式总是从左到右计算，这将始终匹配第一个实例.

Replace the regular expression /nothing/ with whatever string you want to search for. Since regular expressions are always evaluated left-to-right, this will always match the first instance.

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