如何在PHP中替换字符串的一部分? [英] How do I replace part of a string in PHP?

问题描述

我正在尝试获取字符串的前10个字符，并想用'_'替换空格.

I am trying to get the first 10 characters of a string and want to replace space with '_'.

我有

  $text = substr($text, 0, 10);
  $text = strtolower($text);

但是我不确定下一步该怎么做.

But I am not sure what to do next.

我想要字符串

这是对字符串的测试.

this is the test for string.

成为

this_is_th

this_is_th

推荐答案

只需使用您可以在之前的substr和strtolower调用之后执行此操作，就像这样:

You would do this after your previous substr and strtolower calls, like so:

$text = substr($text,0,10);
$text = strtolower($text);
$text = str_replace(' ', '_', $text);

不过，如果您想花哨的话，可以一行完成:

If you want to get fancy, though, you can do it in one line:

$text = strtolower(str_replace(' ', '_', substr($text, 0, 10)));

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