php 自定义UTF8和cp1251函数

1. <?php 
2. */ 
3. function cp1251_to_utf8($s){ 
4.            $c209 = chr(209); $c208 = chr(208); $c129 = chr(129); 
5.            for($i=0; $i<strlen($s); $i++)    { 
6.                $c=ord($s[$i]); 
7.                if ($c>=192 and $c<=239) $t.=$c208.chr($c-48); 
8.                elseif ($c>239) $t.=$c209.chr($c-112); 
9.                elseif ($c==184) $t.=$c209.$c209; 
10.                elseif ($c==168)    $t.=$c208.$c129; 
11.                else $t.=$s[$i]; 
12.            } 
13.            return $t; 
14.        } 
15.         function utf8_to_cp1251($s) 
16.         { 
17.             for ($c=0;$c<strlen($s);$c++) 
18.             { 
19.                $i=ord($s[$c]); 
20.                if ($i<=127) $out.=$s[$c]; 
21.                    if ($byte2){ 
22.                        $new_c2=($c1&3)*64+($i&63); 
23.                        $new_c1=($c1>>2)&5; 
24.                        $new_i=$new_c1*256+$new_c2; 
25.                    if ($new_i==1025){ 
26.                        $out_i=168; 
27.                    } else { 
28.                        if ($new_i==1105){ 
29.                            $out_i=184; 
30.                        } else { 
31.                            $out_i=$new_i-848; 
32.                        } 
33.                    } 
34.                    $out.=chr($out_i); 
35.                    $byte2=false; 
36.                    } 
37.                if (($i>>5)==6) { 
38.                    $c1=$i; 
39.                    $byte2=true; 
40.                } 
41.             } 
42.             return $out; 
43.         } 
44. ?>