删除会干扰格式的特殊字符 [英] Remove special characters that mess with formating

问题描述

我当前正在创建聊天，但似乎找不到阻止用户发布与聊天的格式混淆并使最终用户退出聊天的特殊字符的方法.

I am currently creating a chat and can't seem to find a way to stop users from posting special characters that mess with formatting of the chat and lagging end users out of the chat.

我基本上是试图将其完全删除.我知道我现在拥有的代码如果可行的话，应该是技术上的"只能替换它们，但是我只是想让它首先起作用.

I am basically trying to remove them entirely. I know the code I have right now "technically if it worked" should only replace them, however I was just trying to get this to work first.

这是我用来检查/擦除变量的代码.我以为htmlentities()可以做到，但似乎无法正常工作.

Here is the code that I am using to censor/scrape the variables. I thought htmlentities() would do it but does not seem to be working properly.

            $message = $censor->censorString(
            $this->parseUrls(
                htmlentities(
                    strip_tags(
                        $message)
                )
            )
        ); //Stripping $message of profanity, html tags, and special characters

这是我的问题的屏幕截图:

Here is a screenshot of my problem:

推荐答案

与您在StackOverflow上发现的许多答案相反， 用支持正则表达式的引擎清理"Zalgo"文本很简单在Unicode类别上匹配. PHP的preg_*函数使用PCRE库.如果PCRE是使用--enable-unicode-properties编译的，则可以使用以下命令剥离所有Unicode组合标记:

Contrary to many answers you'll find on StackOverflow, it is trivial to sanitize "Zalgo" text with a regex engine that supports matching on Unicode categories. PHP's preg_* functions use the PCRE library. If PCRE is compiled with --enable-unicode-properties, you can strip all Unicode combining marks using:

$sanitized = preg_replace('/\pM/u', '', $zalgo);

或者允许一定数量的连续组合标记，例如:

Or allow a certain maximum of consecutive combining marks, say one:

$sanitized = preg_replace('/(\pM)\pM+/u', '\1', $zalgo);

或两个:

$sanitized = preg_replace('/(\pM{2})\pM+/u', '\1', $zalgo);

这会使Zalgo文字变成

This will turn Zalgo text like

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