stream_socket_recvfrom
(PHP 5)
stream_socket_recvfrom — Receives data from a socket, connected or not
说明
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.
参数
- 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:
Possible values for flags 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.
返回值
Returns the read data, as a string
范例
Example #1 stream_socket_recvfrom() example
<?php
$server = stream_socket_server('tcp://127.0.0.1:1234');
$socket = stream_socket_accept($server);
echo "Received Out-Of-Band: '" . stream_socket_recvfrom($socket, 1500, STREAM_OOB) . "'
";
echo "Data: '" . stream_socket_recvfrom($socket, 1500, STREAM_PEEK) . "'
";
echo "Data: '" . stream_socket_recvfrom($socket, 1500) . "'
";
fclose($socket);
fclose($server);
?>
注释
Note:
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).
Note:
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.
参见
- 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
