(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_getpeername — Queries the remote side of the given socket which may either result in host/port or in a Unix filesystem path, dependent on its type
socket_getpeername ( resource $socket , string &$address [, int &$port ] ) : bool
Queries the remote side of the given socket which may either result in host/port or in a Unix filesystem path, dependent on its type.
socket
A valid socket resource created with socket_create() or socket_accept().
address
If the given socket is of type AF_INET or AF_INET6, socket_getpeername() will return the peers (remote) IP address in appropriate notation (e.g. 127.0.0.1 or fe80::1) in the address parameter and, if the optional port parameter is present, also the associated port.
If the given socket is of type AF_UNIX, socket_getpeername() will return the Unix filesystem path (e.g. /var/run/daemon.sock) in the address parameter.
port
If given, this will hold the port associated to address.
Returns true on success or false on failure. socket_getpeername() may also return false if the socket type is not any of AF_INET, AF_INET6, or AF_UNIX, in which case the last socket error code is not updated.
Note:
socket_getpeername() should not be used with
AF_UNIXsockets created with socket_accept(). Only sockets created with socket_connect() or a primary server socket following a call to socket_bind() will return meaningful values.
Note:
For having socket_getpeername() to return a meaningful value, the socket it is applied upon must of course be one for which the concept of "peer" makes sense.
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https://www.php.net/manual/en/function.socket-getpeername.php