php 替换 隐藏在文本中的字符
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replace characters that are hidden in text
提问by Behnam
How to remove (that are hidden) and SPACES in below text but
如何 在下面的文本中删除（隐藏的）和空格，但是
- hold UNICODE characters
- hold
<br>tag
- 保存 UNICODE 字符
- 持有
<br>标签
i tested:
我测试：
- i used
trim($string)=> NOT WORKED - i used
str_replace(' ', '', $string)=> NOT WORKED i used some regex => NOT WORKED
<br>????? ????: ?????? ?? ???? ??? ????
- 我用过
trim($string)=> 没用 - 我用过
str_replace(' ', '', $string)=> 没用 我使用了一些正则表达式 => 不工作
<br>????? ????: ?????? ?? ???? ??? ????
UPDATE: 
Thanks
更新：谢谢
回答by Mostafa M
This solution will work, I tested it:
此解决方案将起作用，我对其进行了测试：
$string = htmlentities($content, null, 'utf-8');
$content = str_replace(" ", "", $string);
$content = html_entity_decode($content);
回答by Ben Carey
Not tested, but if you use something like:
未经测试，但如果您使用类似的东西：
$string = preg_replace("/\s/",'',$string);
That should remove all spaces.
那应该删除所有空格。
UPDATE
更新
To remove all spaces and references, use something like:
要删除所有空格和 引用，请使用以下内容：
$string = preg_replace("/\s| /",'',$string);
UPDATE 2
更新 2
Try this:
尝试这个：
$string = html_entity_decode($string);
$string = preg_replace("/\s/",'',$string);
echo $string;
Forgot to say, reconvert the html entities so add this after the replacement:
忘了说，重新转换html实体，所以在替换后添加：
htmlentities($string);
回答by Oleksiy Muzalyev
All solutions above kind of work, until one starts to work with German language where there are such letters:
以上所有解决方案都有效，直到开始使用德语，那里有这样的字母：
? ä
and othere simial ones. I use the following code:
和其他类似的。我使用以下代码：
$string = preg_replace ( "!\s++!u", ' ', $string );
More details here: PCRE(3) Library Functions Manual
更多详细信息：PCRE(3) 库函数手册
回答by FullStackEngineer
This worked for me.
这对我有用。
preg_replace("/ /",'',$string)