网络函数

checkdnsrr — 给指定的主机（域名）或者IP地址做DNS通信检查
closelog — 关闭系统日志链接
dns_check_record — 别名 checkdnsrr
dns_get_mx — 别名 getmxrr
dns_get_record — 获取指定主机名的 DNS 纪录
fsockopen — 打开 Internet 或者 Unix 套接字连接
gethostbyaddr — 获取指定 IP 地址对应的 Internet 主机名
gethostbyname — 返回主机名对应的 IPv4地址。
gethostbynamel — 获取互联网主机名对应的 IPv4 地址列表
gethostname — 获取主机名
getmxrr — 获取 Internet 主机名对应的 MX 记录
getprotobyname — Get protocol number associated with protocol name
getprotobynumber — Get protocol name associated with protocol number
getservbyname — 获取互联网服务协议对应的端口
getservbyport — Get Internet service which corresponds to port and protocol
header — 发送原生 HTTP 头
header_register_callback — 调用一个 header 函数
header_remove — 删除之前设置的 HTTP 头
headers_list — 返回已发送的 HTTP 响应头（或准备发送的）
headers_sent — 检测消息头是否已经发送
http_response_code — 获取/设置响应的 HTTP 状态码
inet_ntop — Converts a packed internet address to a human readable representation
inet_pton — Converts a human readable IP address to its packed in_addr representation
ip2long — 将 IPV4 的字符串互联网协议转换成长整型数字
long2ip — 将长整型转化为字符串形式带点的互联网标准格式地址（IPV4）
net_get_interfaces — 获取网络接口
openlog — Open connection to system logger
pfsockopen — 打开持久的 Internet 或 Unix 套接字连接
setcookie — 发送 Cookie
setrawcookie — 发送未经 URL 编码的 cookie
socket_get_status — 别名 stream_get_meta_data
socket_set_blocking — 别名 stream_set_blocking
socket_set_timeout — 别名 stream_set_timeout
syslog — Generate a system log message

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17 years ago

A simple and very fast function to check against CIDR.

Your previous examples are too complicated and involves a lot of functions call.

Here it is (only with arithmetic operators and call only to ip2long () and split() ):
<?php
  function ipCIDRCheck ($IP, $CIDR) {
    list ($net, $mask) = split ("/", $CIDR);
    
    $ip_net = ip2long ($net);
    $ip_mask = ~((1 << (32 - $mask)) - 1);

    $ip_ip = ip2long ($IP);

    $ip_ip_net = $ip_ip & $ip_mask;

    return ($ip_ip_net == $ip_net);
  }
?>
call example: <?php echo ipCheck ("192.168.1.23", "192.168.1.0/24"); ?>

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Anton Avramov - lukav at lukav dot com ¶

7 years ago

An improved version of claudiu at cnixs dot com not using split and working with the following: 
ip: 192.168.101.123, CIRD: 192.168.101.144/24 

<?php 
function ipCIDRCheck ($IP, $CIDR) {
    list ($net, $mask) = explode ('/', $CIDR);
    
    $ip_net = ip2long ($net);
    $ip_mask = ~((1 << (32 - $mask)) - 1);

    $ip_ip = ip2long ($IP);

    return (($ip_ip & $ip_mask) == ($ip_net & $ip_mask));
  }
?>

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Anonymous ¶

8 years ago

improved version of philippe-at-cyberabuse.org's answer:

<?php
function cidrconv($net) { 
    $start = strtok($net,"/"); 
    $n = 3 - substr_count($net, "."); 
    if ($n > 0)
    {
        for ($i = $n;$i > 0; $i--)
            $start .= ".0";
    } 
    $bits1 = str_pad(decbin(ip2long($start)), 32, "0", STR_PAD_LEFT);
    $net = (1 << (32 - substr(strstr($net, "/"), 1))) - 1; 
    $bits2 = str_pad(decbin($net), 32, "0", STR_PAD_LEFT); 
    $final = "";
    for ($i = 0; $i < 32; $i++)
    { 
        if ($bits1[$i] == $bits2[$i]) $final .= $bits1[$i]; 
        if ($bits1[$i] == 1 and $bits2[$i] == 0) $final .= $bits1[$i]; 
        if ($bits1[$i] == 0 and $bits2[$i] == 1) $final .= $bits2[$i]; 
    } 
    return array($start, long2ip(bindec($final))); 
}
?>

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David GASTALDIN ¶

17 years ago

Here a IP-Range to CIDRs function that I wrote for the purpose of filling my Postfix client.cidr with ripe-ncc data to block spamming from useless countries. Strcmp functions are meant to work around the silly PHP string comparison which inevitably tries compare strings as numbers when possible. I'll make no comment about that fact ... bit I have to bite my tong hard :

function PlageVersCIDRs($ip_min, $ip_max) {
    $cidrs = array();
    $ip_min_bin = sprintf('%032b', $ip_min);
    $ip_max_bin = sprintf('%032b', $ip_max);
    $ip_cour_bin = $ip_min_bin;
    while (strcmp($ip_cour_bin, $ip_max_bin) <= 0) {
        $lng_reseau = 32;
        $ip_reseau_bin = $ip_cour_bin;
        while (($ip_cour_bin[$lng_reseau - 1] == '0') && (strcmp(substr_replace($ip_reseau_bin, '1', $lng_reseau - 1, 1), $ip_max_bin) <= 0)) {
            $ip_reseau_bin[$lng_reseau - 1] = '1';
            $lng_reseau--;
        }
        $cidrs[] = long2ip(bindec($ip_cour_bin)).'/'.$lng_reseau;
        $ip_cour_bin = sprintf('%032b', bindec($ip_reseau_bin) + 1);
    }
    return $cidrs;
}

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philippe-at-cyberabuse.org ¶

22 years ago

PHP miss CIDR functions.



This one will convert a CIDR like this:

0.0.0.0/16 -> 0.0.0.0 - 0.0.255.255

127.0/16 -> 127.0.0.0 - 127.0.255.255

etc...



function cidrconv($net) {

$start=strtok($net,"/");

$n=3-substr_count($net, ".");

if ($n>0) { for ($i=$n;$i>0;$i--) $start.=".0"; }

$bits1=str_pad(decbin(ip2long($start)),32,"0","STR_PAD_LEFT");

$net=pow(2,(32-substr(strstr($net,"/"),1)))-1;

$bits2=str_pad(decbin($net),32,"0","STR_PAD_LEFT");

for ($i=0;$i<32;$i++) {

if ($bits1[$i]==$bits2[$i]) $final.=$bits1[$i];

if ($bits1[$i]==1 and $bits2[$i]==0) $final.=$bits1[$i];

if ($bits1[$i]==0 and $bits2[$i]==1) $final.=$bits2[$i];

}

return $start." - ".long2ip(bindec($final));

}

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-1

nexxer at rogers dot com ¶

19 years ago

In Trevor Hemsley's translation of the perl range2cidr function, the 

while ($end > $start) 

condition should be

while ($end >= $start)

otherwise it won't work for /32s, ie if you feed range2cidr("1.2.3.4", "1.2.3.4").

-- nex

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-2

-dR ¶

8 years ago

This little function might come in handy

<?php
function cidr_range( $cidr, $chkip=null )
{
    // Assign IP / mask
    list($ip,$mask) = explode("/",$cidr);

    // Sanitize IP
    $ip1 = preg_replace( '_(\d+\.\d+\.\d+\.\d+).*$_', '$1', "$ip.0.0.0" );

    // Calculate range
    $ip2 = long2ip( ip2long( $ip1 ) - 1 + ( 1 << ( 32 - $mask) ) );

    // are we cidr range cheking?
    if ( $chkip != null && ! filter_var( $chkip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) === false )
    {
        return ip2long( $ip1 ) <= ip2long( $chkip ) && ip2long( $ip2 ) >= ip2long( $chkip ) ? true : false;
    } else {
        return "$ip1 - $ip2";
    }
}

var_dump( cidr_range( "127.0/16", "127.0.0.1" ) );   // bool(true)
var_dump( cidr_range( "127.0/16", "192.168.0.1" ) ); // bool(false)
var_dump( cidr_range( "192.168.0.0/24" ) );          // string(27) "192.168.0.0 - 192.168.0.255"

?>

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-2

Anonymous ¶

21 years ago

Alternative cidr_conv function - a little easier to follow

function cidr_conv($cidr_address) {
  $first = substr($cidr_address, 0, strpos($cidr_address, "/"));
  $netmask = substr(strstr($cidr_address, "/"), 1);

  $first_bin = str_pad(decbin(ip2long($first)), 32, "0", STR_PAD_LEFT);
  $netmask_bin = str_pad(str_repeat("1", (integer)$netmask), 32, "0", STR_PAD_RIGHT);
  
  for ($i = 0; $i < 32; $i++) {
    if ($netmask_bin[$i] == "1") 
      $last_bin .= $first_bin[$i];
    else
      $last_bin .= "1";
  }

  $last = long2ip(bindec($last_bin));

  return "$first - $last";
}

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-4

samuele at norsam dot org ¶

20 years ago

To find if an IP is in a net/mask (very fast):
<?php
function isIPIn($ip,$net,$mask) {
   $lnet=ip2long($net);
   $lip=ip2long($ip);
   $binnet=str_pad( decbin($lnet),32,"0","STR_PAD_LEFT" );
   $firstpart=substr($binnet,0,$mask);
   $binip=str_pad( decbin($lip),32,"0","STR_PAD_LEFT" );
   $firstip=substr($binip,0,$mask);
   return(strcmp($firstpart,$firstip)==0);
   }
?>

This function can be compacted, avoiding some variable settings, but the function will not be too clear to read...
Example code, used to made a kind of location service network-based:

<?php
$n = array ( "192.168.0.0/16"   => "TUSCANY",
             "192.168.1.0/24"   => "- Florence",
             "192.168.2.0/24"   => "- Pisa",
             "192.168.3.0/24"   => "- Siena",
             "192.168.64.0/21" => "- Tuscan Archipelago",
             "192.168.64.0/23" => "--- Elba Island",
             "192.168.66.0/24" => "--- Capraia Island",
             "192.168.67.0/24" => "--- Giannutri Island");

// Normally you should use the following line
$myip = $HTTP_SERVER_VARS['REMOTE_ADDR'];
// This is first example: returns Tuscany/Pisa
$myip = "192.168.2.33";
// This is second example: returns Tuscany/T.Arch./Elba
$myip = "192.168.65.34";

echo "Your position:<br />\n";
foreach ( $n as $k=>$v ) {
   list($net,$mask)=split("/",$k);
   if (isIPIn($myip,$net,$mask)) {
       echo $n[$k]."<br />\n"; }
   }
?>

and so on...

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-5

dand at ddchosting.com ¶

18 years ago

When I was working on a project I ran into this problem with redirecting. My solution is as follows:

header("Refresh: 5; url=../main/main.php?".session_id()."");



This allowed me to pass the session_id() which is used throughout site to make sure user has loged in. 

I hope this helps!

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