PHP regular retains only Chinese characters, letters and numbers

//所有中英文符号

$str = "?><？》”\"《喂喂喂555？》《|“：L}{P+_)In thsdff0?><M<>\"s~!@#$%^&*()+_)(*&dsdffsde~！	@#￥%……&*5545445（）+——）（*&……%￥#@！~ 电影_后天 230809-peopl.e die我d.(*&^%$#@!!~";

echo match_chinese($str);

function match_chinese($chars,$encoding=&#39;utf8&#39;)
{
    $pattern =($encoding==&#39;utf8&#39;)?&#39;/[\x{4e00}-\x{9fa5}a-zA-Z0-9]/u&#39;:&#39;/[\x80-\xFF]/&#39;;
    preg_match_all($pattern,$chars,$result);
    $temp =join(&#39;&#39;,$result[0]);
    return $temp;
}