Note that stream_socket_recvfrom() bypasses stream wrappers including TLS/SSL. While reading from an encrypted stream with fread() will return decrypted data, using stream_socket_recvfrom() will give you the original encrypted bytes.
(PHP 5, PHP 7, PHP 8)
stream_socket_recvfrom — Receives data from a socket, connected or not
$socket,$length,$flags = 0,&$address = null
stream_socket_recvfrom() accepts
data from a remote socket up to length bytes.
socketThe 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 the read data, as a string, 或者在失败时返回 false.
示例 #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);
?>注意:
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).
注意:
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.
Note that stream_socket_recvfrom() bypasses stream wrappers including TLS/SSL. While reading from an encrypted stream with fread() will return decrypted data, using stream_socket_recvfrom() will give you the original encrypted bytes.This method may return a peer address not compatible with stream_socket_sendto() if in ipv6.
The ip returned by recvfrom is not within brackets ([]), and has the port appended, which makes it look like ::1:1234. To cut it properly, use strrpos()