提取出现在几个禁止字符之一之前的字符 [英] Extract characters occurring before one of several forbidden characters

问题描述

我想在遇到几个不需要的字符之一时立即丢弃字符串中所有剩余的字符.

I want to discard all remaining characters in a string as soon as one of several unwanted characters is encountered.

一旦遇到列入黑名单的字符，应返回该点之前的字符串.

As soon as a blacklisted character is encountered, the string before that point should be returned.

例如，如果我有一个数组:

For instance, if I have an array:

$chars = array("a", "b", "c");

我将如何通过以下字符串...

How would I go through the following string...

log dog hat bat

...最后得到:

log dog h

推荐答案

strcspn 函数就是你要找的.

The strcspn function is what you are looking for.

<?php

$mask = "abc";

$string = "log dog hat bat";

$result = substr($string,0,strcspn($string,$mask));

var_dump($result);

?>

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