php-doc-en/reference/stream/functions/stream-socket-server.xml

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<refentry xml:id="function.stream-socket-server" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stream_socket_server</refname>
  <refpurpose>Create an Internet or Unix domain server socket</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>stream_socket_server</methodname>
   <methodparam><type>string</type><parameter>local_socket</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">errno</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter role="reference">errstr</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>STREAM_SERVER_BIND | STREAM_SERVER_LISTEN</initializer></methodparam>
   <methodparam choice="opt"><type>resource</type><parameter>context</parameter></methodparam>
  </methodsynopsis>
  <para>
   Creates a stream or datagram socket on the specified
   <parameter>local_socket</parameter>.    
  </para>
  <para>
   This function only creates a socket, to begin accepting connections
   use <function>stream_socket_accept</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>local_socket</parameter></term>
     <listitem>
      <para>
       The type of socket created is determined by the transport specified
       using standard URL formatting: <literal>transport://target</literal>.
      </para>
      <para>
       For Internet Domain sockets (<constant>AF_INET</constant>) such as TCP and UDP, the
       <literal>target</literal> portion of the 
       <parameter>remote_socket</parameter> parameter should consist of a
       hostname or IP address followed by a colon and a port number.  For
       Unix domain sockets, the <literal>target</literal> portion should
       point to the socket file on the filesystem.
      </para>
      <para>
       Depending on the environment, Unix domain sockets may not be available.
       A list of available transports can be retrieved using
       <function>stream_get_transports</function>. See
       <xref linkend="transports"/> for a list of bulitin transports.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>errno</parameter></term>
     <listitem>
      <para>
       If the optional <parameter>errno</parameter> and <parameter>errstr</parameter>
       arguments are present they will be set to indicate the actual system
       level error that occurred in the system-level <literal>socket()</literal>,
       <literal>bind()</literal>, and <literal>listen()</literal> calls. If
       the value returned in <parameter>errno</parameter> is 
       <literal>0</literal> and the function returned &false;, it is an
       indication that the error occurred before the <literal>bind()</literal>
       call. This is most likely due to a problem initializing the socket. 
       Note that the <parameter>errno</parameter> and
       <parameter>errstr</parameter> arguments will always be passed by reference.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>errstr</parameter></term>
     <listitem>
      <para>
       See <parameter>errno</parameter> description.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       A bitmask field which may be set to any combination of socket creation
       flags.  The default value of flags is <constant>STREAM_SERVER_BIND</constant>
       | <constant>STREAM_SERVER_LISTEN</constant>.
      </para>
      <note>
       <para>
        For UDP sockets, you must use <constant>STREAM_SERVER_BIND</constant> as
        the <parameter>flags</parameter> parameter.
       </para>
      </note>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>context</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the created stream, or &false; on error.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Using TCP server sockets</title>
    <programlisting role="php">
<![CDATA[
<?php
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
  echo "$errstr ($errno)<br />\n";
} else {
  while ($conn = stream_socket_accept($socket)) {
    fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n");
    fclose($conn);
  }
  fclose($socket);
}
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   The example below shows how to act as a time server which can respond
   to time queries as shown in an example on <function>stream_socket_client</function>.
   <note>
    <simpara>
     Most systems require root access to create a server socket on a port
     below 1024.
    </simpara>
   </note>
   <example>
    <title>Using UDP server sockets</title>
    <programlisting role="php">
<![CDATA[
<?php
$socket = stream_socket_server("udp://127.0.0.1:1113", $errno, $errstr, STREAM_SERVER_BIND);
if (!$socket) {
    die("$errstr ($errno)");
}

do {
    $pkt = stream_socket_recvfrom($socket, 1, 0, $peer);
    echo "$peer\n";
    stream_socket_sendto($socket, date("D M j H:i:s Y\r\n"), 0, $peer);
} while ($pkt !== false);

?>

]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &ipv6.brackets;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>stream_socket_client</function></member>
   <member><function>stream_set_blocking</function></member>
   <member><function>stream_set_timeout</function></member>
   <member><function>fgets</function></member>
   <member><function>fgetss</function></member>
   <member><function>fwrite</function></member>
   <member><function>fclose</function></member>
   <member><function>feof</function></member>
   <member><link linkend="ref.curl">Curl extension</link></member>
  </simplelist>
 </refsect1>
</refentry>

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