PHP determines whether a character is a Chinese character

This requires the use of regular expressions (Recommended learning: PHP video tutorial)

preg_match('/[\x{4e00}-\x{9fa5}]/u', $str)    //UTF-8

This can match the string Whether there is Chinese, if not, return 0

<?
$str = "测试中文";
echo $str;
echo "<hr>";
//if (preg_match("/^[".chr(0xa1)."-".chr(0xff)."]+$/", $str)) { //只能在GB2312情况下使用
//if (preg_match("/^[\x7f-\xff]+$/", $str)) { //兼容gb2312,utf-8  //判断字符串是否全是中文
if (preg_match("/[\x7f-\xff]/", $str)) {  //判断字符串中是否有中文
echo "正确输入";
} else {
echo "错误输入";
}
?>

Attached, double-byte character encoding range

GBK (GB2312/GB18030)

\x00 -\xff GBK double-byte encoding range

\x20-\x7f ASCII

\xa1-\xff Chinese gb2312

\x80-\xff Chinese gbk

UTF-8 (Unicode)

\u4e00-\u9fa5 (Chinese)

\x3130-\x318F (Korean

\xAC00 -\xD7A3 (Korean)

\u0800-\u4e00 (Japanese)*/

The above is the detailed content of PHP determines whether a character is a Chinese character. For more information, please follow other related articles on the PHP Chinese website!