The function ip2long() generates an 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.
A standard format address.
Returns the long integer or FALSE
if ip_address
is invalid.
Prior to this version, on Windows ip2long() would sometimes return a valid number even if passed a value which was not an (IPv4) Internet Protocol dotted address.
Prior to this version, ip2long() would sometimes return a valid number even if passed a value which was not an (IPv4) Internet Protocol dotted address.
Because PHP's integer 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.
ip2long() will return FALSE
for the IP 255.255.255.255 in PHP 5 <= 5.0.2. It was fixed in PHP 5.0.3 where it returns -1 (same as PHP 4).
<?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; ?>
This second example shows how to print a converted address with the printf() function in both PHP 4 and PHP 5:
<?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 $long . "\n"; // -1073732954 printf("%u\n", ip2long($ip)); // 3221234342 } ?>
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