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Php ip2long () function

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(PHP 4 , PHP 5)

ip2long --  Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address


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 then -1 is returned. Note that -1 does not evaluate as FALSE in PHP.

Note: As of PHP 5.0.0 ip2long() returns FALSE when ip_address is invalid.

Example 1. ip2long() Example

= gethostbyname('');
$out = "The following URLs are equivalent:<br />\n";
$out .= ', http://' . $ip . '/, and http://' . sprintf("%u", ip2long($ip)) . "/<br />\n";

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 in both PHP 4 and PHP 5:

Example 2. Displaying an IP address

= gethostbyname('');
$long = ip2long($ip);

if (
$long == -1 || $long === FALSE) {
'Invalid IP, please try again';
} else {
$ip   . "\n";           //
echo $long . "\n";           // -1073732954
printf("%u\n", ip2long($ip)); // 3221234342

ip2long() should not be used as the sole form of IP validation. Combine it with long2ip():

Example 3. IP validation

// make sure IPs are valid. also converts a non-complete IP into
// a proper dotted quad as explained below.
$ip = long2ip(ip2long("")); // ""
$ip = long2ip(ip2long("10.0.0")); // ""
$ip = long2ip(ip2long("10.0.256")); // ""

ip2long() will also work with non-complete IP addresses. Read for more info.

Note: ip2long() will return -1 (PHP 4) or FALSE (PHP 5) for the IP

See also long2ip() and sprintf().

Php ip2long Function syntax tag

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Php ip2long syntax tutorial

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