The socket_recvfrom() function receives len
bytes of data in buf
from name
on port port
(if the socket is not of type AF_UNIX
) using socket
. socket_recvfrom() can be used to gather data from both connected and unconnected sockets. Additionally, one or more flags can be specified to modify the behaviour of the function.
The name
and port
must be passed by reference. If the socket is not connection-oriented, name
will be set to the internet protocol address of the remote host or the path to the UNIX socket. If the socket is connection-oriented, name
is NULL
. Additionally, the port
will contain the port of the remote host in the case of an unconnected AF_INET
or AF_INET6
socket.
The socket
must be a socket resource previously created by socket_create().
The data received will be fetched to the variable specified with buf
.
Up to len
bytes will be fetched from remote host.
The value of flags
can be any combination of the following flags, joined with the binary OR (|) operator.
Flag | Description |
---|---|
MSG_OOB | Process out-of-band data. |
MSG_PEEK | Receive data from the beginning of the receive queue without removing it from the queue. |
MSG_WAITALL | Block until at least len are received. However, if a signal is caught or the remote host disconnects, the function may return less data. |
MSG_DONTWAIT | With this flag set, the function returns even if it would normally have blocked. |
If the socket is of the type AF_UNIX
type, name
is the path to the file. Else, for unconnected sockets, name
is the IP address of, the remote host, or NULL
if the socket is connection-oriented.
This argument only applies to AF_INET
and AF_INET6
sockets, and specifies the remote port from which the data is received. If the socket is connection-oriented, port
will be NULL
.
socket_recvfrom() returns the number of bytes received, or FALSE
if there was an error. The actual error code can be retrieved by calling socket_last_error(). This error code may be passed to socket_strerror() to get a textual explanation of the error.
socket_recvfrom()
<?php error_reporting(E_ALL | E_STRICT); $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); socket_bind($socket, '127.0.0.1', 1223); $from = ''; $port = 0; socket_recvfrom($socket, $buf, 12, 0, $from, $port); echo "Received $buf from remote address $from and remote port $port" . PHP_EOL; ?>
This example will initiate a UDP socket on port 1223 of 127.0.0.1 and print at most 12 characters received from a remote host.
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