javascript 从 PHP 中的 UTF-8 字符串中删除控制字符
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Removing control characters from a UTF-8 string in PHP
提问by MirrorMirror
So I am removing control characters (tab, cr, lf, \v and all other invisible chars) in the client side (after input) but since the client cannot be trusted, I have to remove them in the server too.
所以我在客户端（输入后）删除控制字符（tab、cr、lf、\v 和所有其他不可见字符），但由于客户端不可信，我也必须在服务器中删除它们。
so according to this link http://www.utf8-chartable.de/
所以根据这个链接http://www.utf8-chartable.de/
the control characters are from x00 to 1F and from 7F to 9F. thus my client (javascript) control char removal function is:
控制字符从 x00 到 1F，从 7F 到 9F。因此我的客户端（javascript）控制字符删除功能是：
return s.replace(/[\x00-\x1F\x7F-\x9F]/g, "");
and my php (server) control char removal function is:
我的php（服务器）控制字符删除功能是：
$s = preg_replace('/[\x00-\x1F\x7F-\x9F]/', '', $s);
Now this seems to create problems with international utf8 chars such as ? (xCF x82) in PHP only (because x82 is inside the second sequence group), the javascript equivalent does not create any problems.
现在这似乎给国际 utf8 字符带来了问题，例如 ? (xCF x82) 仅在 PHP 中（因为 x82 在第二个序列组内），javascript 等效项不会产生任何问题。
Now my question is, should I remove the control characters from 7F to 9F? To my understanding those the sequences from 127 to 159 (7F to 9F) obviously can be part of a valid UTF-8 string?
现在我的问题是，我应该将控制字符从 7F 删除到 9F 吗？据我了解，从 127 到 159（7F 到 9F）的序列显然可以是有效 UTF-8 字符串的一部分？
also, maybe I shouldn't even filter the 00 to 31 control characters because also some of those characters can appear in some weird (japanese? chinese?) but valid utf-8 characters ?
另外，也许我什至不应该过滤 00 到 31 个控制字符，因为其中一些字符也可能出现在一些奇怪的（日语？中文？）但有效的 utf-8 字符中？
采纳答案by MirrorMirror
it seems that I just need to add the uflag to the regex thus it becomes:
似乎我只需要在正则表达式中添加u标志，这样它就变成了：
$s = preg_replace('/[\x00-\x1F\x7F-\x9F]/u', '', $s);
