PHP正则删除字符串中所有中文的程序代码

/*转换为UTF8 再处理*/

$a = mb_convert_encoding($a, 'UTF-8', 'GB2312');
$a = preg_replace("/[x{4e00}-x{9fff}]/u", "", $a);
 
/*再转回来*

$a = mb_convert_encoding($a, 'GB2312', 'UTF-8');

$chstr="中文区间afeowahgieawhjo中文区间fawgwea中文区间aghoiawghowi中文区间";
$match="/[中文区间|中文区间|我靠|中文区间]/";
$chstr=preg_replace($match,"",$chstr);
echo $chstr;