PHP inet_ntop function

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inet_ntop

(PHP 5 >= 5.1.0RC1)

This function converts a 32bit IPv4, or 128bit IPv6 address (if PHP
was built with IPv6 support enabled) into an address family appropriate
string representation. Returns FALSE on failure.

Example 1. inet_ntop() Example

$packed = chr(127) . chr(0) . chr(0) . chr(1);
$expanded = inet_ntop($packed);
 
/* Outputs: 127.0.0.1 */
echo $expanded;
 
$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = inet_ntop($packed);
 
/* Outputs: ::1 */
echo $expanded;

Note: This function is not
implemented on Windows platforms.

See also long2ip(),
inet_pton(), and
ip2long().