PHP regular method example to determine whether a string contains Chinese characters

This article mainly shares with you examples of PHP regular methods to determine whether a string contains Chinese characters. I hope it can help you.

PHP regularity determines whether a string contains Chinese characters

The first method:

if (preg_match("/[\x7f-\xff]/", $str)) {
    //echo "有中文";
}else{
    //echo "没有中文";
}

The second method:

  if(preg_match ("/[\x{4e00}-\x{9fa5}]/u", $keyword)){
        // 汉字
        $where['goods_name like'] =  '%'.$keyword.'%';
   }else{
        // 拼音
        $where['pinyin like'] =  '%'.strtolower($keyword).'%';
   }

I have been searching online for a long time. Most of them are java and js methods, but using Java and js methods directly, old It was an error, but later I found out

Wrap both sides of "4e00" and "9fa5" with "{" and "}" respectively, and it worked

What should be noted here is: preg_match() When verifying Chinese, you need to add /u

I know utf-8 in php The final correct expression using regular expressions to match Chinese characters under encoding——/^[\x{4e00}-\x{9fa5}]+$/u, I know where the problem is. For other detailed rules, you can just change it yourself

Attach a piece of code

$str = "php入坑指南";
if (preg_match("/^[\x{4e00}-\x{9fa5}]+$/u",$str)) {
     print("该字符串全部是中文");
} else {
     print("该字符串不全部是中文");
}

Attached, double-byte character encoding range

1. GBK (GB2312/GB18030)
\x00-\xff GBK double-byte encoding range
\x20-\x7f ASCII
\xa1-\xff Chinese gb2312
\x80-\xff Chinese gbk

2. UTF-8 (Unicode)
\u4e00-\u9fa5 (Chinese)
\x3130-\x318F (Korean
\xAC00-\ xD7A3 (Korean)
\u0800-\u4e00 (Japanese)*/

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