ip2long

Description

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; ?>

<?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
}
?>

See also long2ip() and sprintf().