socket-write.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.socket-write" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>socket_write</refname>
  <refpurpose>Write to a socket</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>false</type></type><methodname>socket_write</methodname>
   <methodparam><type>Socket</type><parameter>socket</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   The function <function>socket_write</function> writes to the
   <parameter>socket</parameter> from the given
   <parameter>data</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>socket</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       The buffer to be written.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       The optional parameter <parameter>length</parameter> can specify an
       alternate length of bytes written to the socket. If this length is
       greater than <parameter>data</parameter>'s length,
       it is silently truncated to the length of <parameter>data</parameter>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the number of bytes successfully written to the socket&return.falseforfailure;.
   The error code can be retrieved with
   <function>socket_last_error</function>. This code may be passed to
   <function>socket_strerror</function> to get a textual explanation of the
   error.
  </para>
  <note>
   <para>
    It is perfectly valid for <function>socket_write</function> to
    return zero which means no bytes have been written. Be sure to use the
    <literal>===</literal> operator to check for &false; in case of an
    error.
   </para>
  </note>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &sockets.changelog.socket-param;
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>length</parameter> is nullable now.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    <function>socket_write</function> does not necessarily write all bytes
    from <parameter>data</parameter>. It's valid that, depending on the network
    buffers etc., only a certain amount of data, even one byte, is written
    despite <parameter>data</parameter> being longer.
    A loop must be used to ensure that the rest of <parameter>data</parameter>
    is transmitted.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>socket_accept</function></member>
    <member><function>socket_bind</function></member>
    <member><function>socket_connect</function></member>
    <member><function>socket_listen</function></member>
    <member><function>socket_read</function></member>
    <member><function>socket_strerror</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->