PHP Velho Oeste 2025

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    User Contributed Notes 5 notes

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    37
    claudiu at cnixs dot com
    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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    10
    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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    4
    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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    2
    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;
    }
    up
    2
    philippe-at-cyberabuse.org
    23 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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