How to keep only Chinese characters in php

How to implement php to only retain Chinese characters: first create a PHP sample file; then transcode through mb_convert_encoding; finally use preg_match_all to filter out non-Chinese characters and only retain Chinese characters.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

PHP implements filtering out non-Chinese characters and only retaining Chinese characters

<?php
 
$str = "a 1b 2b＜中文＞。xxyy字符";
 
//转换 GB2312 -> UTF-8
$str = mb_convert_encoding($str, &#39;UTF-8&#39;, &#39;GB2312&#39;);
 
preg_match_all(&#39;/[\x{4e00}-\x{9fff}]+/u&#39;, $str, $matches);
$str = join(&#39;&#39;, $matches[0]);
 
//转换 UTF-8 -> GB2312
$str = mb_convert_encoding($str, &#39;GB2312&#39;, &#39;UTF-8&#39;); 
 
echo $str; //输出 中文字符
 
?>

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