preg_replace所有空格 [英] preg_replace all spaces

问题描述

我正在尝试用下划线替换所有空格，但以下内容不起作用:

I'm trying to replace all spaces with underscores and the following is not working:

$id = "aa aa";
echo $id;
preg_replace('/\s+/', '_', $id);
echo $id;

打印

aa aaaa aa

推荐答案

函数preg_replace不会就地修改字符串.它返回带有替换结果的新字符串.您应将调用结果分配给$id变量:

The function preg_replace doesn't modify the string in-place. It returns a new string with the result of the replacement. You should assign the result of the call back to the $id variable:

$id = preg_replace('/\s+/', '_', $id);

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