php 如何从句子中删除多余的空格、制表符和换行符，并将它们替换为一个空格？

How do I remove extra spaces, tabs and line feeds from a sentence and substitute them with just one space?

提问by Kumar

Possible Duplicate:
remove multiple whitespaces in php

可能的重复：
删除 php 中的多个空格

I have a stream of characters, a sentence or a paragraph, which may have extra spaces in two words or even tabs or line feeds, how can I remove all these and substitute them by a single whitespace.

我有一个字符流、一个句子或一个段落，其中两个单词甚至制表符或换行符中可能有多余的空格，我如何删除所有这些并用单个空格替换它们。

回答by jeroen

You could use a regular expression like:

您可以使用如下正则表达式：

preg_replace("/\s+/", " ", $string);

That should replace all multiple white-spaces, tabs and new-lines with just one.

这应该用一个替换所有多个空格、制表符和换行符。

Thanks to @ridgerunnerfor the suggestion - it can significantly faster if you add the 'S'study modifier:

感谢@ridgerunner的建议 - 如果您添加'S'研究修改器，它可以显着加快：

preg_replace('/\s+/S', " ", $string);

'S'helps "non-anchored patterns that do not have a single fixed starting character" - i.e. a character class.

'S'帮助“没有单个固定起始字符的非锚定模式” - 即字符类。