PHP: Hypertext Preprocessor (original) (raw)
socket_getpeername
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_getpeername — Queries the remote side of the given socket
Description
Parameters
socket
A Socket instance created with socket_create() or socket_accept().
address
If the given socket is of type [AF_INET](sockets.constants.php#constant.af-inet) or**[AF_INET6](sockets.constants.php#constant.af-inet6)**, socket_getpeername() will return the peers (remote) IP address in appropriate notation (e.g. 127.0.0.1 orfe80::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](sockets.constants.php#constant.af-unix),socket_getpeername() will return the Unix filesystem path (e.g. /var/run/daemon.sock) in theaddress parameter.
port
If given, this will hold the port associated toaddress.
Return Values
Returns [true](reserved.constants.php#constant.true) on success or [false](reserved.constants.php#constant.false) on failure. socket_getpeername() may also return**[false](reserved.constants.php#constant.false)** if the socket type is not any of [AF_INET](sockets.constants.php#constant.af-inet),[AF_INET6](sockets.constants.php#constant.af-inet6), or [AF_UNIX](sockets.constants.php#constant.af-unix), in which case the last socket error code is not updated.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | socket is a Socket instance now; previously, it was a resource. |
Notes
Note:
socket_getpeername() should not be used with**
[AF_UNIX](sockets.constants.php#constant.af-unix)** sockets 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.
See Also
- socket_getsockname() - Queries the local side of the given socket which may either result in host/port or in a Unix filesystem path, dependent on its type
- socket_last_error() - Returns the last error on the socket
- socket_strerror() - Return a string describing a socket error
Found A Problem?
redph0enix at hotmail dot com ¶
21 years ago
`socket_getpeername will not work for UDP sockets. Instead, use socket_recvfrom - it provides the IP address and port of the source server - eg:
size=socketrecvfrom(size=socket_recvfrom(size=socketrecvfrom(socket,$input,65535,0,$ipaddress,$port);
echo "Received [$input] ($size bytes) from IP ipaddressPortipaddress Port ipaddressPortport\n";
`
9 years ago
The reason it won't work for UDP is that UDP is stateless; logically there are no peers other than at the time a packet is sent or received. Or more strictly, a UDP socket can interact with 0..N peers.