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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<refentry id="function.stream-socket-recvfrom">
<refnamediv>
<refname>stream_socket_recvfrom</refname>
<refpurpose>Receives data from a socket, connected or not </refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>string</type><methodname>stream_socket_recvfrom</methodname>
<methodparam><type>resource</type><parameter>socket</parameter></methodparam>
<methodparam><type>int</type><parameter>length</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>flags</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter role="reference">address</parameter></methodparam>
</methodsynopsis>
<para>
The function <function>stream_socket_recvfrom</function> accepts
data from a remote socket up to <parameter>length</parameter> bytes.
If <parameter>address</parameter> is provided it will be populated with
the address of the remote socket.
</para>
<para>
The value of <parameter>flags</parameter> can be any combination
of the following:
<table>
<title>possible values for <parameter>flags</parameter></title>
<tgroup cols="2">
<tbody>
<row>
<entry><constant>STREAM_OOB</constant></entry>
<entry>
Process OOB (out-of-band) data.
</entry>
</row>
<row>
<entry><constant>STREAM_PEEK</constant></entry>
<entry>
Retrieve data from the socket, but do not consume the buffer.
Subsequent calls to <function>fread</function> or
<function>stream_socket_recvfrom</function> will see
the same data.
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<example>
<title><function>stream_socket_recvfrom</function> Example</title>
<programlisting role="php">
<![CDATA[
<?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);
?>
]]>
</programlisting>
</example>
<note>
<para>
If a message received is longer than the <parameter>length</parameter>
parameter, excess bytes may be discarded depending on the type of socket
the message is received from (such as UDP).
</para>
</note>
<note>
<para>
Calls to <function>stream_socket_recvfrom</function> on socket-based
streams, after calls to buffer-based stream functions (like
<function>fread</function> or <function>stream_get_line</function>) read
data directly from the socket and bypass the stream buffer.
</para>
</note>
<para>
See also
<function>stream_socket_sendto</function>,
<function>stream_socket_client</function>, and
<function>stream_socket_server</function>.
</para>
</refsect1>
</refentry>
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