gethostbyaddr()
gethostbyaddr() — Get the Internet host name corresponding to a given IP address.
Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.
Signature
gethostbyaddr(string $ip): string|false
Parameters
| Parameter | Type | What it takes |
|---|---|---|
| $ip | string | The host IP address. |
Return value
Returns the host name on success, the unmodified ip on failure, or false on malformed input.
Example
A runnable snippet:
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']); echo $hostname;
See also
gethostbyname(), gethostbynamel()
All PHP 8.5 built-in functions
Reference card built from the PHP manual page gethostbyaddr() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.