ip2long() should not be used as the sole form
of IP validation. Combine it with long2ip():
<?php // make sure IPs are valid. also converts a non-complete IP into // a proper dotted quad as explained below. $ip = long2ip(ip2long("127.0.0.1")); // "127.0.0.1" $ip = long2ip(ip2long("10.0.0")); // "10.0.0.0" $ip = long2ip(ip2long("10.0.256")); // "10.0.1.0" ?>
Notes
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.
Note:
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).
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