socket_getsockname()

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

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

说明

socket_getsockname(resource $socket,string &$addr[,int &$port]): bool

Note:socket_getsockname() should not be used with AF_UNIX sockets created with socket_connect(). Only sockets created with socket_accept() or a primary server socket following a call to socket_bind() will return meaningful values.

参数

$socket

A valid socket resource created with socket_create() or socket_accept().

$addr

If the given socket is of type AF_INET or AF_INET6,socket_getsockname() will return the localIP 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_getsockname() will return the Unix filesystem path(e.g./var/run/daemon.sock)in the$addressparameter.

$port

If provided, this will hold the associated port.

返回值

成功时返回TRUE，或者在失败时返回FALSE。socket_getsockname() 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.

参见

• 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_last_error()Returns the last error on the socket
• socket_strerror()Return a string describing a socket error

Curiously, getsockname() works for socket_create() and socket_create_pair() Unix-domain (AF_UNIX) sockets if one calls socket_bind() after creation to name the formerly anonymous socket(s). 
Using a socket_bind() call also results in a file system "file" (socket, first character 's' in an "ls -l" listing) being created with the given name. Such a "file" will need to be removed explicitly, as closing the socket will not remove it.