禁止IP的函数_PHP教程

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; $i if ($i $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; $i if (ereg("[([0-9] )-([0-9] )]",$maskocts[$i],$regs)) {
if ( ($ipocts[$i] > $regs[2]) || ($ipocts[$i] $result = 0;
}
}
else
{
if ($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;
}


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