Php/docs/function.ip2long
ip2long
(PHP 4, PHP 5, PHP 7)
ip2long — Converts a string containing an (IPv4) Internet Protocol dotted address into a long integer
Description
ip2long
( string $ip_address
) : int
The function ip2long() generates a long integer representation of IPv4 Internet network address from its Internet standard format (dotted string) representation.
ip2long() will also work with non-complete IP addresses. Read » http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm for more info.
Parameters
ip_address- A standard format address.
Return Values
Returns the long integer or FALSE if ip_address
is invalid.
Examples
Example #1 ip2long() Example
<?php$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 $out;?>
Example #2 Displaying an IP address
This second example shows how to print a converted address with the printf() function:
<?php$ip = gethostbyname('www.example.com');$long = ip2long($ip);if ($long == -1 || $long === FALSE) { echo 'Invalid IP, please try again';} else { echo $ip . "\n"; // 192.0.34.166 echo $long . "\n"; // 3221234342 (-1073732954 on 32-bit systems, due to integer overflow) printf("%u\n", ip2long($ip)); // 3221234342}?>
Notes
Note:
Because PHP's int type is signed, and many IP addresses will result in negative integers on 32-bit architectures, you need to use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned IP address.
Note:
ip2long() will return
FALSEfor the IP255.255.255.255in PHP 5 <= 5.0.2, and-1on 64-bits systems in PHP 5 <=5.2.4. It was fixed in PHP 5.2.5 where it returns4294967295. 32-bit systems will return-1due to the integer value overflowing.
