PHP中英混合字符串截取函数代码

代码如下:

1. function get_word($string, $length, $dot = '..',$charset='gbk') {
   
2. if(strlen($string) <= $length) {
   
3. return $string;
   
4. }
   
5. $string = str_replace(array('　',' ', '&', '"', '<', '>'), array('','','&', '"', '<', '>'), $string);
   
6. $strcut = '';
   
7. if(strtolower($charset) == 'utf-8') {
   
8. $n = $tn = $noc = 0;
   
9. while($n < strlen($string)) {
   
10. $t = ord($string[$n]);
    
11. if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
    
12. $tn = 1; $n++; $noc++;
    
13. } elseif(194 <= $t && $t <= 223) {
    
14. $tn = 2; $n += 2; $noc += 2;
    
15. } elseif(224 <= $t && $t < 239) {
    
16. $tn = 3; $n += 3; $noc += 2;
    
17. } elseif(240 <= $t && $t <= 247) {
    
18. $tn = 4; $n += 4; $noc += 2;
    
19. } elseif(248 <= $t && $t <= 251) {
    
20. $tn = 5; $n += 5; $noc += 2;
    
21. } elseif($t == 252 || $t == 253) {
    
22. $tn = 6; $n += 6; $noc += 2;
    
23. } else {
    
24. $n++;
    
25. }
    
26. if($noc >= $length) {
    
27. break;
    
28. }
    
29. }
    
30. if($noc > $length) {
    
31. $n -= $tn;
    
32. }
    
33. $strcut = substr($string, 0, $n);
    
34. } else {
    
35. for($i = 0; $i < $length; $i++) {
    
36. $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
    
37. }
    
38. }
    
39. return $strcut.$dot;
    
40. }
    
41. $str = "欢迎 visit 简明 nowamagic";
    
42. $str_result = get_word($str, 12);
    
43. echo $str_result;

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测试运行结果：
欢迎 visit..