php 自定义UTF8和cp1251函数

当你需要从utf8转换一些数据，cp1251（窗- 1251）或cp1251到utf8你必须使用系统功能的iconv。常见的主机服务商不允许使用此功能。
*/
function cp1251_to_utf8($s){
           $c209 = chr(209); $c208 = chr(208); $c129 = chr(129);
           for($i=0; $i                $c=ord($s[$i]);
               if ($c>=192 and $c<=239) $t.=$c208.chr($c-48);
               elseif ($c>239) $t.=$c209.chr($c-112);
               elseif ($c==184) $t.=$c209.$c209;
               elseif ($c==168)    $t.=$c208.$c129;
               else $t.=$s[$i];
           }
           return $t;
       }

        function utf8_to_cp1251($s)
        {
            for ($c=0;$c             {
               $i=ord($s[$c]);
               if ($i<=127) $out.=$s[$c];
                   if ($byte2){
                       $new_c2=($c1&3)*64+($i&63);
                       $new_c1=($c1>>2)&5;
                       $new_i=$new_c1*256+$new_c2;
                   if ($new_i==1025){
                       $out_i=168;
                   } else {
                       if ($new_i==1105){
                           $out_i=184;
                       } else {
                           $out_i=$new_i-848;
                       }
                   }
                   $out.=chr($out_i);
                   $byte2=false;
                   }
               if (($i>>5)==6) {
                   $c1=$i;
                   $byte2=true;
               }
            }
            return $out;
        }