1 /* 
 2 
 3  Utf-8、gb2312都支持的汉字截取函数 
 4 
 5  cut_str(字符串, 截取长度, 开始长度, 编码); 
 6 
 7  编码默认为 utf-8 
 8 
 9  开始长度默认为 0 
10 
11 */ 
12 
13 function cutStr($string, $sublen, $start = 0, $code = 'UTF-8'){ 
14 
15     if($code == 'UTF-8'){ 
16 
17         $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; 
18 
19         preg_match_all($pa, $string, $t_string); 
20 
21  
22 
23         if(count($t_string[0]) - $start > $sublen) return join('', array_slice
24 ($t_string[0], $start, $sublen))."..."; 
25 
26         return join('', array_slice($t_string[0], $start, $sublen)); 
27 
28     }else{ 
29 
30         $start = $start*2; 
31 
32         $sublen = $sublen*2; 
33 
34         $strlen = strlen($string); 
35 
36         $tmpstr = ''; 
37 
38  
39 
40         for($i=0; $i<$strlen; $i++){ 
41 
42             if($i>=$start && $i<($start+$sublen)){ 
43 
44                 if(ord(substr($string, $i, 1))>129){ 
45 
46                     $tmpstr.= substr($string, $i, 2); 
47 
48                 }else{ 
49 
50                     $tmpstr.= substr($string, $i, 1); 
51 
52                 } 
53 
54             } 
55 
56             if(ord(substr($string, $i, 1))>129) $i++; 
57 
58         } 
59 
60         if(strlen($tmpstr)<$strlen ) $tmpstr.= "..."; 
61 
62         return $tmpstr; 
63 
64     } 
65 
66 }
67 
68 //使用方法如下
69 
70 $str = "jQuery插件实现的加载图片和页面效果"; 
71 
72 echo cutStr($str,16);