php中文编码判断代码

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

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; $i < strlen($str); $i++){
28. $value = ord($str[$i]);
29. if($value > 127) {
30. $count++;
31. if($value >= 192 && $value <= 223) $i++;
32. elseif($value >= 224 && $value <= 239) $i = $i + 2;
33. elseif($value >= 240 && $value <= 247) $i = $i + 3;
34. else die('not a utf-8 compatible string');
35. }
36. $count++;
37. }
38. return $count;
39. }
40. //截取字符串-utf8(php)
41. function utf8_substr($str,$position,$length){
42. $start_position = strlen($str);
43. $start_byte = 0;
44. $end_position = strlen($str);
45. $count = 0;
46. for($i = 0; $i < strlen($str); $i++){
47. if($count >= $position && $start_position > $i){
48. $start_position = $i;
49. $start_byte = $count;
50. }
51. if(($count-$start_byte)>=$length) {
52. $end_position = $i;
53. break;
54. }
55. $value = ord($str[$i]);
56. if($value > 127){
57. $count++;
58. if($value >= 192 && $value <= 223) $i++;
59. elseif($value >= 224 && $value <= 239) $i = $i + 2;
60. elseif($value >= 240 && $value <= 247) $i = $i + 3;
61. else die('not a utf-8 compatible string');
62. }
63. $count++;
64. }
65. return(substr($str,$start_position,$end_position-$start_position));
66. }
67. //判断是否是有韩文-utf-8 (javascript)
68. function checkkoreachar(str) {
69. for(i=0; iif(((str.charcodeat(i) > 0x3130 && str.charcodeat(i) < 0x318f) || (str.charcodeat(i) >= 0xac00 && str.charcodeat(i) <= 0xd7a3))) {
70. return true;
71. }
72. }
73. return false;
74. }
75. //判断是否有中文字符-gbk (javascript)
76. function check_chinese_char(s){
77. return (s.length != s.replace(/[^\x00-\xff]/g,"**").length);
78. }