转换unicode十进制内码为utf-8编码

zipalpha

1. function uni($str)
   
2. {
   
3.     $ret = '';
   
4.     for ($i = 0; $i < mb_strlen($str, 'utf-8'); $i = $i + 1) {
   
5.         $ret .= "&#" . uniord(mb_substr($str, $i, 1, 'utf-8')) . ";";
   
6.     }
   
7.     return $ret;
   
8. }
   
9. 
   
10. function uniord($u)
    
11. {
    
12.     $c = unpack("N", mb_convert_encoding($u, 'UCS-4BE', 'UTF-8'));
    
13.     return $c[1];
    
14. }
    
15. 
    
16. function unichr($u)
    
17. {
    
18.     return mb_convert_encoding(pack("N", $u), mb_internal_encoding(), 'UCS-4BE');
    
19. }
    
20. 
    
21. function u2utf8($c)
    
22. {
    
23.     $str = "";
    
24.     if ($c < 0x80) {
    
25.         $str .= chr($c);
    
26.     } else if ($c < 0x800) {
    
27.         $str .= chr(0xC0 | $c >> 6);
    
28.         $str .= chr(0x80 | $c & 0x3F);
    
29.     } else if ($c < 0x10000) {
    
30.         $str .= chr(0xE0 | $c >> 12);
    
31.         $str .= chr(0x80 | $c >> 6 & 0x3F);
    
32.         $str .= chr(0x80 | $c & 0x3F);
    
33.     } else if ($c < 0x200000) {
    
34.         $str .= chr(0xF0 | $c >> 18);
    
35.         $str .= chr(0x80 | $c >> 12 & 0x3F);
    
36.         $str .= chr(0x80 | $c >> 6 & 0x3F);
    
37.         $str .= chr(0x80 | $c & 0x3F);
    
38.     }
    
39.     return $str;
    
40. }
    
41. 
    
42. $source = '好好学习,天天向上';
    
43. $source = uni($source);
    
44. var_dump($source); 
45. // string(69) "&#22909;&#22909;&#23398;&#20064;&#44;&#22825;&#22825;&#21521;&#19978;" //
46. preg_match_all("/&#([0-9]+);/", $source, $regs);
    
47. var_dump($regs);
    
48. foreach ($regs[1] as $v) {
    
49.     $source = str_replace("&#$v;", u2utf8($v), $source);
    
50. }
    
51. var_dump($source);
52. // string(25) "好好学习,天天向上" //