stream_socket_recvfrom
(PHP 5, PHP 7, PHP 8)
stream_socket_recvfrom — Receives data from a socket, connected or not
Beschreibung
resource
$socket,int
$length,int
$flags = 0,?string
&$address = null): string|false
stream_socket_recvfrom() accepts
data from a remote socket up to length bytes.
Parameter-Liste
-
socket -
The remote socket.
-
length -
The number of bytes to receive from the
socket. -
flags -
The value of
flagscan be any combination of the following:Possible values for flagsSTREAM_OOBProcess OOB ( out-of-band) data.STREAM_PEEKRetrieve 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
addressis provided it will be populated with the address of the remote socket.
Rückgabewerte
Returns the read data, as a string,Bei einem Fehler wird false zurückgegeben..
Beispiele
Beispiel #1 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($socket, 1500, STREAM_OOB) . "'\n";
/* Take a peek at the normal in-band data, but don't consume it. */
echo "Data: '" . stream_socket_recvfrom($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);
?>
Anmerkungen
Hinweis:
If a message received is longer than the
lengthparameter, excess bytes may be discarded depending on the type of socket the message is received from (such as UDP).
Hinweis:
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.
Siehe auch
- stream_socket_sendto() - Sends a message to a socket, whether it is connected or not
- stream_socket_client() - Open Internet or Unix domain socket connection
- stream_socket_server() - Create an Internet or Unix domain server socket
