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
define_syslog_variables — Initializes all syslog related variables
dns_check_record — 别名 checkdnsrr
dns_get_mx — 别名 getmxrr
dns_get_record — 获取指定主机的DNS记录
fsockopen — 打开一个网络连接或者一个Unix套接字连接
gethostbyaddr — 获取指定的IP地址对应的主机名
gethostbyname — Get the IPv4 address corresponding to a given Internet host name
gethostbynamel — Get a list of IPv4 addresses corresponding to a given Internet host name
gethostname — Gets the host name
getmxrr — Get MX records corresponding to a given Internet host name
getprotobyname — Get protocol number associated with protocol name
getprotobynumber — Get protocol name associated with protocol number
getservbyname — Get port number associated with an Internet service and protocol
getservbyport — Get Internet service which corresponds to port and protocol
header_register_callback — Call a header function
header_remove — Remove previously set headers
header — 发送原生 HTTP 头
headers_list — Returns a list of response headers sent (or ready to send)
headers_sent — Checks if or where headers have been sent
http_response_code — Get or Set the HTTP response code
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 — 将一个IPV4的字符串互联网协议转换成数字格式
long2ip — Converts an long integer address into a string in (IPv4) Internet standard dotted format
openlog — Open connection to system logger
pfsockopen — 打开一个持久的网络连接或者Unix套接字连接。
setcookie — Send a cookie
setrawcookie — Send a cookie without urlencoding the cookie value
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

用户评论:

[#1] -dR [2015-11-13 11:40:47]

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" ?>

[#2] David GASTALDIN [2007-06-21 08:12:19]

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;
}

[#3] claudiu at cnixs dot com [2007-04-22 02:52:25]

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"); ?>

[#4] dand at ddchosting.com [2006-04-08 14:28:38]

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!

[#5] metator at netcabo dot pt [2005-07-27 20:22:56]

Regarding samuele's note:

You can get faster code if you apply directly what happens in  network devices, such as routers. If you AND (logic operation) the remote ip against the local netmask the result will be the network ip if the remote ip is from the local network. Example:

    192.168.0.16 = 11000000.10101000.00000000.00010000
& 255.255.255.0 = 11111111.11111111.11111111.00000000
--------------------------------------------------------------
   192.168.0.0 = 11000000.10101000.00000000.00000000

And now the code. My example uses a html form where you place the values you want to test:

<HTML><HEAD><TITLE>Check IP</TITLE>
</HEAD><BODY>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">

Hope you find this useful.
IP to check: <input type="text" name="ip"> <br>
Local network ip: <input type="text" name="net"> <br>
Local netmask: <input type="text" name="mask"> <br>
<input type="submit" name="check" value="Check it!">
</form>
<?php function isIPIn($ip, $net, $mask) {     //doesn't check for the return value of ip2long     $ip = ip2long($_POST['ip']);     $rede = ip2long($_POST['net']);     $mask = ip2long($_POST['mask']);          //AND     $res = $ip & $mask;          return ($res == $rede); } if (isset($_POST['check'])) {      echo isIPIn($_POST['ip'], $_POST['net'], $_POST['mask']) ? "IP IN.": "IP OUT."; } ?>
</BODY><HTML>

[#6] nexxer at rogers dot com [2005-02-24 17:16:04]

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

[#7] samuele at norsam dot org [2003-11-25 09:01:57]

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...

[#8] anderson at piq dot com dot br [2003-08-06 22:10:03]

If you want to get the interface of an IP, based on the local route table, use this.

function GetIfaceforIP($user_ip)
{
    $route = "/bin/netstat -rn";

    exec($route, $aoutput);
    foreach($aoutput as $key => $line)
    {
        if($key > 1)
        {
            $line = ereg_replace("[[:space:]]+",",",$line);
            list($network, $gateway, $mask, $flags, $mss, $window, $irtt, $iface) = explode(",", $line)
            if((ip2long($user_ip) & ip2long($mask)) == ip2long($network))
            {
                return $iface;
            }
        }
    }
}

[#9] [2003-04-02 20:11:27]

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";
}

[#10] trevor-hemsley at nospam dot dial dot pipex dot com [2002-10-16 11:53:46]

Previous example of IP range to CIDR list does not cope with ranges as well as the perl Net::Netmask range2cidrlist() function. In PHP this looks like

<?php function imask($this) { // use base_convert not dechex because dechex is broken and returns 0x80000000 instead of 0xffffffff return base_convert((pow(2,32) - pow(2, (32-$this)))), 10, 16); } function imaxblock($ibase, $tbit) { while ($tbit > 0) { $im = hexdec(imask($tbit-1)); $imand = $ibase & $im; if ($imand != $ibase) { break; } $tbit--; } return $tbit; } function range2cidrlist($istart, $iend) { // this function returns an array of cidr lists that map the range given $s = explode(".", $istart); // PHP ip2long does not handle leading zeros on IP addresses! 172.016 comes back as 172.14, seems to be treated as octal! $start = ""; $dot = ""; while (list($key,$val) = each($s)) { $start = sprintf("%s%s%d",$start,$dot,$val); $dot = "."; } $end = ""; $dot = ""; $e = explode(".",$iend); while (list($key,$val) = each($e)) { $end = sprintf("%s%s%d",$end,$dot,$val); $dot = "."; } $start = ip2long($start); $end = ip2long($end); $result = array(); while ($end > $start) { $maxsize = imaxblock($start,32); $x = log($end - $start + 1)/log(2); $maxdiff = floor(32 - floor($x)); $ip = long2ip($start); if ($maxsize < $maxdiff) { $maxsize = $maxdiff; } array_push($result,"$ip/$maxsize"); $start += pow(2, (32-$maxsize)); } return $result; } ?>

[#11] philippe-at-cyberabuse.org [2002-10-12 15:49:51]

... and this one will do the opposite (o return NULL for invalid netblocks) :

1.0.0.0 1.0.255.255 -> 1.0.0.0/16
1.0.0.0 1.3.255.255 -> 1.0.0.0/14
192.168.0.0 192.168.0.255 -> 192.168.0.0/24

function ip2cidr($ip_start,$ip_end) {
if(long2ip(ip2long($ip_start))!=$ip_start or long2ip(ip2long($ip_end))!=$ip_end) return NULL;
$ipl_start=(int)ip2long($ip_start);
$ipl_end=(int)ip2long($ip_end);
if($ipl_start>0 && $ipl_end<0) $delta=($ipl_end+4294967296)-$ipl_start;
else $delta=$ipl_end-$ipl_start;
$netmask=str_pad(decbin($delta),32,"0","STR_PAD_LEFT");
if(ip2long($ip_start)==0 && substr_count($netmask,"1")==32) return "0.0.0.0/0";
if($delta<0 or ($delta>0 && $delta%2==0)) return NULL;
for($mask=0;$mask<32;$mask++) if($netmask[$mask]==1) break;
if(substr_count($netmask,"0")!=$mask) return NULL;
return "$ip_start/$mask";
}

[#12] philippe-at-cyberabuse.org [2001-12-14 19:46:14]

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));
}

网络 函数

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网络函数