ip2long
(PHP 4 )
ip2long --
Converts a string containing an (IPv4) Internet Protocol dotted address
into a proper address.
Description
int
ip2long ( string ip_address)
The function ip2long() generates an IPv4 Internet
network address from its Internet standard format (dotted string)
representation. If ip_address is invalid than
-1 is returned. Note that -1
does not evaluate as FALSE in PHP.
Example 1. ip2long() Example <?php
$ip = gethostbyname("www.example.com");
$out = "The following URLs are equivalent:<br>\n";
$out .= "http://www.example.com/, http://".$ip."/, and http://".sprintf("%u",ip2long($ip))."/<br>\n";
echo $out;
?> |
|
Note:
Because PHP's integer type is signed, and many IP addresses will
result in negative integers, you need to use the "%u" formatter of
sprintf() or printf() to get
the string representation of the unsigned IP address.
This second example shows how to print a converted address with the
printf() function :
Example 2. Displaying an IP address <?php
$ip = gethostbyname("www.example.com");
$long = ip2long($ip);
if ($long === -1) {
print "Invalid IP, please try again";
} else {
print $ip . "\n"; // 192.0.34.166
print $long . "\n"; // -1073732954
printf("%u\n", ip2long($ip)); // 3221234342
}
?> |
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Note:
ip2long() will return -1 for
the ip 255.255.255.255
See also long2ip() and
sprintf().