php-doc-en/reference/sockets/functions/socket-set-option.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.socket-set-option">
 <refnamediv>
  <refname>socket_set_option</refname>
  <refpurpose>Sets socket options for the socket</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>socket_set_option</methodname>
   <methodparam><type>resource</type><parameter>socket</parameter></methodparam>
   <methodparam><type>int</type><parameter>level</parameter></methodparam>
   <methodparam><type>int</type><parameter>optname</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>optval</parameter></methodparam>
  </methodsynopsis>
  <para>
   The <function>socket_set_option</function> function sets the option
   specified by the <parameter>optname</parameter> parameter, at the
   specified protocol <parameter>level</parameter>, to the value pointed to
   by the <parameter>optval</parameter> parameter for the 
   <parameter>socket</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>socket</parameter></term>
     <listitem>
      <para>
       A valid socket resource created with <function>socket_create</function>
       or <function>socket_accept</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>level</parameter></term>
     <listitem>
      <para>
       The <parameter>level</parameter> parameter specifies the protocol
       level at which the option resides. For example, to retrieve options at
       the socket level, a <parameter>level</parameter> parameter of
       <constant>SOL_SOCKET</constant> would be used. Other levels, such as
       TCP, can be used by specifying the protocol number of that level. 
       Protocol numbers can be found by using the 
       <function>getprotobyname</function> function.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>optname</parameter></term>
     <listitem>
      <para>
       The available socket options are the same as those for the
       <function>socket_get_option</function> function.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>optval</parameter></term>
     <listitem>
      <para>
       The option value.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>socket_set_option</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

if (!is_resource($socket)) {
    echo 'Unable to create socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1)) {
    echo 'Unable to set option on socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

if (!socket_bind($socket, '127.0.0.1', 1223)) {
    echo 'Unable to bind socket: '. socket_strerror(socket_last_error()) . PHP_EOL;
}

$rval = socket_get_option($socket, SOL_SOCKET, SO_REUSEADDR);

if ($rval === false) {
    echo 'Unable to get socket option: '. socket_strerror(socket_last_error()) . PHP_EOL;
} else if ($rval !== 0) {
    echo 'SO_REUSEADDR is set on socket !' . PHP_EOL;
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>4.3.0</entry>
       <entry>
        This function was renamed. It used to be called
        <function>socket_setopt</function>.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

</refentry>

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