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gethostbyaddr

Description

The gethostbyaddr of Network for PHP gets the Internet host name corresponding to a given IP address.

Syntax

gethostbyaddr(
    string $ip
): string|false

Parameters

ip

The host IP address.

Return

Returns the host name on success, the unmodified ip on failure, or false on malformed input.

Examples

1 · ip

<?

$ip = "185.85.0.29";

$return = gethostbyaddr($ip);

echo $return;

ip-185-85-0-29.ax5z.com

2 · ip · REMOTE_ADDR

<?

$ip = $_SERVER["REMOTE_ADDR"];

$return = gethostbyaddr($ip);

echo $return;

ip-185-85-0-29.ax5z.com

3 · ip · unmodified

<?

$ip = "0.0.0.0";

$return = gethostbyaddr($ip);

echo $return;

0.0.0.0

4 · ip · malformed

<?

$ip = "0.0.0.0.0";

$return = gethostbyaddr($ip);

var_export($return);

false