PHP Regular Determining String Encoding_PHP Tutorial

Regular expression judgment for Chinese (automatic recognition of utf-8 & gbk encoding)
The following example program is a PHP regular expression program that correctly matches utf8 or gbk Chinese, and can accurately obtain the recognition of Chinese characters in different encoding conditions.

3. $action = trim($_get[action]);
4. if($action == "sub")
5. {
6. $str = $_post[dir];
7. //if(!preg_match("/^[".chr(0xa1 )."-".chr(0xff)."a-za-z0-9_] $/",$str)) //gb2312 Chinese alphanumeric underline regular expression
8. if(!preg_match(" /^[x{4e00}-x{9fa5}a-za-z0-9_] $/u",$str)) //utf-8 Chinese alphanumeric underline regular expression
9. {
10. echo "The [".$str."] you entered contains illegal characters";
11. }
12. else
13. {
14. echo "The [".$str."] you entered is completely legal and passed!";
15. }
16. }
17. ?>
20. Enter characters (Numbers, letters, Chinese characters, underline):

gbk:
preg_match("/^[".chr( 0xa1)."-".chr(0xff)."a-za-z0-9_] $/",$str); //gb2312 Chinese character alphanumeric underline regular expression

http://www.bkjia.com/PHPjc/486134.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/486134.htmlTechArticleRegular judgment of Chinese (automatic recognition of utf-8 gbk encoding) The following example program is a php that correctly matches utf8 Or gbk Chinese regular expression program, which can accurately obtain the Chinese characters of different encoding situations...