禁止ip的函数

<?
function check_ip($range,$ip='') {
if($ip == '') $ip = getenv("REMOTE_ADDR");
if ($ip == "127.0.0.1") return 1;
$result = 1;
if (ereg("([0-9]+).([0-9]+).([0-9]+).([0-9]+)/([0-9]+)",$range,$regs)) {
     $ipl = ip2long($ip);
     $rangel = ip2long($regs[1] . "." . $regs[2] . "." . $regs[3] . "." . $regs[4]);

    $maskl = 0;

     for ($i = 0; $i< 31; $i++) {
        if ($i < $regs[5]-1) {
             $maskl = $maskl + pow(2,(30-$i));
         }
     }

     if (($maskl & $rangel) == ($maskl & $ipl)) {
         return 1;
    } else {
         return 0;
     }
  } else {

     $maskocts = split(".",$range);
   $ipocts = split(".",$ip);
     for ($i=0; $i<4; $i++) {
         if (ereg("[([0-9]+)-([0-9]+)]",$maskocts[$i],$regs)) {
         if ( ($ipocts[$i] > $regs[2]) || ($ipocts[$i] < $regs[1])) {
                 $result = 0;
             }
        }
         else
         {
             if ($maskocts[$i] <> $ipocts[$i]) {
                 $result = 0;
           }
         }
     }
}
return $result;
}

function auth_ip(){
        $result = 0;
        $null_check = 1;

        $path = "ip.cf";  //ip限制配置文件，每行的格式为
                            /*
                            xxx.xxx.xxx.xxx  比如 127.0.0.2
                            xxx.xxx.xxx.[yyy-zzz]  比如 1270.0.0.[2-23]
                            xxx.xxx.xxx.xxx/nn  比如 127.0.0.0/24
                            */
        $fg=@fopen($path,"r");

        while($line=@fgets($fg,1024)){
                $line = trim($line);
                $line=ereg_replace("#.*","",$line);
                if ($line != ""){
                        $null_check = 0;
                        if (check_ip($line)) {
                                fclose($fg);
                                return 1;
                   }
                }
        }
        @fclose($fg);
        if ($null_check == 1) return 1;
        return $result;
}

?>