PHP检查utf-8编码的字符串是否包含中文

方法封装

/**
 *
 * 检查utf-8编码的字符串是否包含中文
 * @param $str
 * @return bool
 */
function checkUtf8StrIncludeCn($str){
    $pattern = '/[x{4e00}-x{9fa5}]/u';
    $result = preg_match($pattern,$str,$match);
    return $result > 0 ? true : false;
}

php中双字节字符编码范围

1. GBK (GB2312/GB18030)
   x00-xff GBK双字节编码范围

2. UTF-8 (Unicode)
   u4e00-u9fa5 (中文) x3130-x318F

参考:
https://www.feiniaomy.com/post/312.html

https://www.cnblogs.com/zhuiluoyu/p/7423987.html