PHP stream_socket_recvfrom() Function

The PHP stream_socket_recvfrom() function is used to accept data from a remote socket up to length bytes.

Syntax

stream_socket_recvfrom(socket, length, flags, address)

Parameters

`socket`	`Required.` Specify the remote socket.
`length`	`Required.` Specify the number of bytes to receive from the socket.
`flags`	`Optional.` 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`	`Optional.` If address is provided it will be populated with the address of the remote socket.

Return Value

Returns the read data, as a string

Example: stream_socket_recvfrom() example

The example below shows the usage of stream_socket_recvfrom() function.

<?php
//opening a server socket to port 1234 on localhost
$server = stream_socket_server('tcp://127.0.0.1:1234');

//accepting the connection
$socket = stream_socket_accept($server);

//accepting a packet (1500 is a typical MTU size) of OOB data
echo "Received Out-Of-Band: '"
     .stream_socket_recvfrom($socket, 1500, STREAM_OOB)."'\n";

//displaying the normal in-band data, but don't consume it
echo "Data: '".stream_socket_recvfrom($socket, 1500, STREAM_PEEK)."'\n";

//getting the exact same packet again, 
//but remove it from the buffer this time
echo "Data: '".stream_socket_recvfrom($socket, 1500)."'\n";

//closing it up
fclose($socket);
fclose($server);
?>

❮ PHP Streams Reference