(PHP 5, PHP 7)
Receives data from a socket, connected or not
string stream_socket_recvfrom ( resource $socket, int $length [, int $flags = 0 [, string &$address ]] )
stream_socket_recvfrom() accepts data from a remote socket up to length bytes.
Parameters:
socket
The remote socket.
length
The number of bytes to receive from the socket.
flags
The value of flags can be any combination of the following:
STREAM_OOB | Process OOB (out-of-band) data. |
STREAM_PEEK | Retrieve data from the socket, but do not consume the buffer. Subsequent calls to fread() or stream_socket_recvfrom() will see the same data. |
address
If address is provided it will be populated with the address of the remote socket.
Returns:
Returns the read data, as a string
Notes:
If a message received is longer than the length parameter, excess bytes may be discarded depending on the type of socket the message is received from (such as UDP).
Calls to stream_socket_recvfrom() on socket-based streams, after calls to buffer-based stream functions (like fread() or stream_get_line()) read data directly from the socket and bypass the stream buffer.
Examples:
stream_socket_recvfrom() example
<?php
/* Open a server socket to port 1234 on localhost */
$server = stream_socket_server('tcp://127.0.0.1:1234');
/* Accept a connection */
$socket = stream_socket_accept($server);
/* Grab a packet (1500 is a typical MTU size) of OOB data */
echo "Received Out-Of-Band: '" . stream_socket_recvfrom($socket, 1500, STREAM_OOB) . "'\n";
/* Take a peek at the normal in-band data, but don't comsume it. */
echo "Data: '" . stream_socket_recvfrom($socket, 1500, STREAM_PEEK) . "'\n";
/* Get the exact same packet again, but remove it from the buffer this time. */
echo "Data: '" . stream_socket_recvfrom($socket, 1500) . "'\n";
/* Close it up */
fclose($socket);
fclose($server);
?>
See also:
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