socket_getpeername()
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
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
说明
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.
参数
- $socket
A valid socket resource created with socket_create() or socket_accept().
- $address
If the given socket is of type
AF_INET
orAF_INET6
,socket_getpeername() will return the peers(remote)IP addressin appropriate notation(e.g.127.0.0.1orfe80::1)in the$addressparameter and, if the optional$portparameter is present, also the associated port.If the given socket is of type
AF_UNIX
,socket_getpeername() will return the Unix filesystem path(e.g./var/run/daemon.sock)in the$addressparameter.- $port
If given, this will hold the port associated to$address.
返回值
成功时返回TRUE
,或者在失败时返回FALSE
。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 isnotupdated.
注释
Note:socket_getpeername() should not be used with
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.
参见
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 typesocket_last_error()
Returns the last error on the socketsocket_strerror()
Return a string describing a socket error
socket_getpeername will not work for UDP sockets. Instead, use socket_recvfrom - it provides the IP address and port of the source server - eg: $size=socket_recvfrom($socket,$input,65535,0,$ipaddress,$port); echo "Received [$input] ($size bytes) from IP $ipaddress Port $port\n";
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.