PHP regular retains only Chinese characters, letters and numbers

This article mainly introduces the php regular expression that only retains Chinese letters and numbers, which has a certain reference value. Now I share it with everyone. Friends in need can refer to it

php regular expression only retains Chinese letters and numbers

//所有中英文符号 $str = "?><？》”\"《喂喂喂555？》《|“：L}{P+_)In thsdff0?>\"s~!@#$%^&*()+_)(*&dsdffsde~！ @#￥%……&*5545445（）+——）（*&……%￥#@！~ 电影_后天 230809-peopl.e die我d.(*&^%$#@!!~"; echo match_chinese($str); function match_chinese($chars,$encoding='utf8') { $pattern =($encoding=='utf8')?'/[\x{4e00}-\x{9fa5}a-zA-Z0-9]/u':'/[\x80-\xFF]/'; preg_match_all($pattern,$chars,$result); $temp =join('',$result[0]); return $temp; }

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