php中文编码判断代码

2. preg_replace(”/([\x80-\xff])/”,”",$str);
3. preg_replace(”/([u4e00-u9fa5])/”,”",$str);

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例子，php中文编码判断。

2. //判断内容里有没有中文-gbk (php)
3. function check_is_chinese($s){
4. return preg_match('/[\x80-\xff]./', $s);
5. }
6. //获取字符串长度-gbk (php)
7. function gb_strlen($str){
8. $count = 0;
9. for($i=0; $i$s = substr($str, $i, 1);
10. if (preg_match("/[\x80-\xff]/", $s)) ++$i;
11. ++$count;
12. }
13. return $count;
14. }
15. //截取字符串字串-gbk (php)
16. function gb_substr($str, $len){
17. $count = 0;
18. for($i=0; $iif($count == $len) break;
19. if(preg_match("/[\x80-\xff]/", substr($str, $i, 1))) ++$i;
20. ++$count;
21. }
22. return substr($str, 0, $i);
23. }
24. //统计字符串长度-utf8 (php)
25. function utf8_strlen($str) {
26. $count = 0;
27. for($i = 0; $i $value = ord($str[$i]);
28. if($value > 127) {
29. $count++;
30. if($value >= 192 && $value elseif($value >= 224 && $value elseif($value >= 240 && $value else die('not a utf-8 compatible string');
31. }
32. $count++;
33. }
34. return $count;
35. }
36. //截取字符串-utf8(php)
37. function utf8_substr($str,$position,$length){
38. $start_position = strlen($str);
39. $start_byte = 0;
40. $end_position = strlen($str);
41. $count = 0;
42. for($i = 0; $i if($count >= $position && $start_position > $i){
43. $start_position = $i;
44. $start_byte = $count;
45. }
46. if(($count-$start_byte)>=$length) {
47. $end_position = $i;
48. break;
49. }
50. $value = ord($str[$i]);
51. if($value > 127){
52. $count++;
53. if($value >= 192 && $value elseif($value >= 224 && $value elseif($value >= 240 && $value else die('not a utf-8 compatible string');
54. }
55. $count++;
56. }
57. return(substr($str,$start_position,$end_position-$start_position));
58. }
59. //判断是否是有韩文-utf-8 (javascript)
60. function checkkoreachar(str) {
61. for(i=0; iif(((str.charcodeat(i) > 0x3130 && str.charcodeat(i) = 0xac00 && str.charcodeat(i) return true;
62. }
63. }
64. return false;
65. }
66. //判断是否有中文字符-gbk (javascript)
67. function check_chinese_char(s){
68. return (s.length != s.replace(/[^\x00-\xff]/g,"**").length);
69. }

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