Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > 5 ways to detect whether a string encoding is UTF8 in PHP

5 ways to detect whether a string encoding is UTF8 in PHP

WBOY
Release： 2016-07-25 08:57:45
Original
2366 people have browsed it
  2. function mb_is_utf8($string)
  3. {
  4. return mb_detect_encoding($string, 'UTF-8') === 'UTF-8';//新发现
  5. }
复制代码

方法二：

  2. function preg_is_utf8($string)
  3. {
  4. return preg_match('/^.*$/u', $string) > 0;//preg_match('/^./u', $string)
  5. }
复制代码

方法三：

  2. function is_utf8_1($str)
  3. {
  4. $c=0; $b=0;
  5. $bits=0;
  6. $len=strlen($str);
  7. for($i=0; $i<$len; $i++){
  8. $c=ord($str[$i]);
  9. if($c > 128){ // bbs.it-home.org
  10. if(($c >= 254)) return false;
  11. elseif($c >= 252) $bits=6;
  12. elseif($c >= 248) $bits=5;
  13. elseif($c >= 240) $bits=4;
  14. elseif($c >= 224) $bits=3;
  15. elseif($c >= 192) $bits=2;
  16. else return false;
  17. if(($i+$bits) > $len) return false;
  18. while($bits > 1){
  19. $i++;
  20. $b=ord($str[$i]);
  21. if($b < 128 || $b > 191) return false;
  22. $bits--;
  23. }
  24. }
  25. }
  26. return true;
  27. }
复制代码

方法四：

  2. function is_utf8_2($string) {
  4. // From http://w3.org/International/questions/qa-forms-utf-8.html
  5. return preg_match('%^(?:
  6. [x09x0Ax0Dx20-x7E] # ASCII
  7. | [xC2-xDF][x80-xBF] # non-overlong 2-byte
  8. | xE0[xA0-xBF][x80-xBF] # excluding overlongs
  9. | [xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte
  10. | xED[x80-x9F][x80-xBF] # excluding surrogates
  11. | xF0[x90-xBF][x80-xBF]{2} # planes 1-3
  12. | [xF1-xF3][x80-xBF]{3} # planes 4-15
  13. | xF4[x80-x8F][x80-xBF]{2} # plane 16
  14. )*$%xs', $string);
  16. } // function is_utf8
复制代码

方法五：

  2. function isUTF8($string)
  3. {
  4. return (utf8_encode(utf8_decode($string)) == $string);
  5. }
复制代码


Related labels：
php检测字符串编码是否为utf8编码的5种方法
source：php.cn
Previous article：How to add and remove backslashes before quotation marks in PHP Next article：PHP header function usage example
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
Possibility to store ASP Classic code as string in MYSQL database Is it possible to store asp classic code into a MySQL database and have it execute the cod...
From 2024-04-06 13:38:43
0
1
358
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template