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

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.socket-get-option">
 <refnamediv>
  <refname>socket_get_option</refname>
  <refpurpose>Gets socket options for the socket </refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>socket_get_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>
  </methodsynopsis>
  <para>
   The <function>socket_get_option</function> function retrieves the value for
   the option specified by the <parameter>optname</parameter> parameter for the
   specified <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>.
      </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
       SOL_SOCKET 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>
      <table>
       <title>Available Socket Options</title>
       <tgroup cols="2">
        <thead>
         <row>
          <entry>Option</entry>
          <entry>Description</entry>
         </row>
        </thead>
        <tbody>
         <row>
          <entry>SO_DEBUG</entry>
          <entry>
           Reports whether debugging information is being recorded.
          </entry>
         </row>
         <row>
          <entry>SO_ACCEPTCONN</entry>
          <entry>
           Reports whether socket listening is enabled.
          </entry>
         </row>
         <row>
          <entry>SO_BROADCAST</entry>
          <entry>
           Reports whether transmission of broadcast messages is supported.
          </entry>
         </row>
         <row>
          <entry>SO_REUSEADDR</entry>
          <entry>
           Reports whether local addresses can be reused.
          </entry>
         </row>
         <row>
          <entry>SO_KEEPALIVE</entry>
          <entry>
           Reports whether connections are kept active with periodic transmission
           of messages. If the connected socket fails to respond to these messages,
           the connection is broken and processes writing to that socket are notified
           with a SIGPIPE signal.
          </entry>
         </row>
         <row>
          <entry>SO_LINGER</entry>
          <entry>
           Reports whether the <parameter>socket</parameter> lingers on <function>socket_close</function> if data is present.
          </entry>
         </row>
         <row>
          <entry>SO_OOBINLINE</entry>
          <entry>
           Reports whether the <parameter>socket</parameter> leaves out-of-band data inline.
          </entry>
         </row>
         <row>
          <entry>SO_SNDBUF</entry>
          <entry>
           Reports send buffer size information.
          </entry>
         </row>
         <row>
          <entry>SO_RCVBUF</entry>
          <entry>
           Reports recieve buffer size information.
          </entry>
         </row>
         <row>
          <entry>SO_ERROR</entry>
          <entry>
           Reports information about error status and clears it.
          </entry>
         </row>
         <row>
          <entry>SO_TYPE</entry>
          <entry>
           Reports the <parameter>socket</parameter> type.
          </entry>
         </row>
         <row>
          <entry>SO_DONTROUTE</entry>
          <entry>
           Reports whether outgoing messages bypass the standard routing facilities.
          </entry>
         </row>
         <row>
          <entry>SO_RCVLOWAT</entry>
          <entry>
           Reports the minimum number of bytes to process for <parameter>socket</parameter> input operations.
           ( Defaults to 1 )
          </entry>
         </row>
         <row>
          <entry>SO_RCVTIMEO</entry>
          <entry>
           Reports the timeout value for input operations.
          </entry>
         </row>
         <row>
          <entry>SO_SNDLOWAT</entry>
          <entry>
           Reports the minimum number of bytes to process for <parameter>socket</parameter> output operations.
          </entry>
         </row>
         <row>
          <entry>SO_SNDTIMEO</entry>
          <entry>
           Reports the timeout value specifying the amount of time that an output
           function blocks because flow control prevents data from being sent.
          </entry>
         </row>
        </tbody>
       </tgroup>
      </table>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the value of the given option, or &false; on errors.
  </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>
        The name of this function was changed. It used to be called
        <literal>socket_getopt()</literal>.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

</refentry>

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