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socket_recvfrom
Receives data from a socket whether or not it is connection-oriented
(PHP 4 >= 4.0.7, PHP 5)
int socket_recvfrom ( resource socket, string &buf, int len, int flags, string &name [, int &port] )
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.
Parameters
- socket
The socket must be a socket resource previously created by socket_create().
- buf
The data received will be fetched to the variable specified with buf.
- len
Up to len bytes will be fetched from remote host.
- flags
The value of flags can be any combination of the following flags, joined with the binary OR (
|) operator.Table 297. Possible values for flags
Flag Description MSG_OOBProcess out-of-band data. MSG_PEEKReceive data from the beginning of the receive queue without removing it from the queue. MSG_WAITALLBlock until at least len are received. However, if a signal is caught or the remote host disconnects, the function may return less data. MSG_DONTWAITWith this flag set, the function returns even if it would normally have blocked. - name
If the socket is of the type
AF_UNIXtype, name is the path to the file. Else, for unconnected sockets, name is the IP address of, the remote host, orNULLif the socket is connection-oriented.- port
This argument only applies to
AF_INETandAF_INET6sockets, and specifies the remote port from which the data is received. If the socket is connection-oriented, port will beNULL.
Return Values
socket_recvfrom() returns the number of bytes received, or -1 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.
Examples
Example 2296. socket_recvfrom() example
<?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 an UDP socket on port 1223 of 127.0.0.1 and print at most 12 characters received from a remote host.