删除utf中的垃圾字符 [英] Remove garbage characters in utf

问题描述

我正在使用utf8格式将所有数据存储到mysql中.在将数据插入数据库之前，我需要使用不需要的字符清除字符串.字符串采用utf8格式.我知道如何使用正则表达式和字符串替换，但不知道如何使用阿拉伯字符.

I am using utf8 format to store all my data into mysql. Before data is inserted into the database I need to clean the strings with unwanted characters. The strings are in utf8 format. I know how to use regex and string replace but do not know how to work with arabic characters.

需要清洗的样品串:████.. الــقــوانين الجديـــدةفيقســـم الـعنايـ"；

Sample string that needs to be cleaned : "████ .. الــقــوانين الجديـــدة في قســـم الـعنايـ";

谢谢

推荐答案

好.如 @Jonathan Leffler 所述，如果您可以为需要替换的字符指定unicode字符范围，您可以使用正则表达式将字符替换为空字符串.

Ok. As @Jonathan Leffler already said, if you can specify the unicode character ranges for the characters that need to be replaced, you can use a regular expression to replace the characters with an empty string.

在表达式中(在PHP中)将Unicode字符指定为<​​c0>.另外，您必须设置 u修饰符使PHP将模式视为UTF8.

A unicode character is specified as \x{FFFF} in an expression (in PHP). In addition, you have to set the u modifier to make PHP treat the pattern as UTF8.

所以最后，您将得到如下内容:

So in the end, you have something like this:

preg_replace('/[\x{FFFF}-\x{FFFF}]+/u','',$string);

其中

• /.../u是定界符加上修饰符
• [...]+是字符类加量词，表示在一个或多个时间段内匹配任何这些字符
• \x{FFFF}-\x{FFFF}是Unicode字符范围(显然，您必须提供正确的代码点/字符编号).

• /.../u are the delimiters plus the modifier
• [...]+ is a character class plus quantifier, which means match any of these characters inside one or mor times
• \x{FFFF}-\x{FFFF} is a unicode character range (obviously you have to provide the right codepoints/numbers of the characters).

您还可以通过^ 否定该组，您可以指定要保留的范围:

You can also negate the group with a ^ you can specify the range which you want to keep:

preg_replace('/[^\x{FFFF}-\x{FFFF}]+/u','',$string);

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更多信息:

• 正则表达式
• PHP中的正则表达式
• Unicode图表

• Regular expressions
• Regular expressions in PHP
• Unicode Charts

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