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# 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.

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
    $ip = gethostbyname("www.example.com");
    printf("%u\n", ip2long($ip));
    echo $out;
    ?>

See also: long2ip()

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