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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.msg-send">
 <refnamediv>
  <refname>msg_send</refname>
  <refpurpose>Send a message to a message queue</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>msg_send</methodname>
   <methodparam><type>resource</type><parameter>queue</parameter></methodparam>
   <methodparam><type>int</type><parameter>msgtype</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>message</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>serialize</parameter><initializer>true</initializer></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>blocking</parameter><initializer>true</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">errorcode</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>msg_send</function> sends a <parameter>message</parameter> of type
   <parameter>msgtype</parameter> (which MUST be greater than 0) to
   the message queue specified by <parameter>queue</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>queue</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>msgtype</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>message</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>serialize</parameter></term>
     <listitem>
      <para>
       The optional <parameter>serialize</parameter> controls how the
       <parameter>message</parameter> is sent.  <parameter>serialize</parameter>
       defaults to &true; which means that the <parameter>message</parameter> is
       serialized using the same mechanism as the session module before being
       sent to the queue.  This allows complex arrays and objects to be sent to
       other PHP scripts, or if you are using the WDDX serializer, to any WDDX
       compatible client.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>blocking</parameter></term>
     <listitem>
      <para>
       If the message is too large to fit in the queue, your script will wait
       until another process reads messages from the queue and frees enough
       space for your message to be sent.
       This is called blocking; you can prevent blocking by setting the
       optional <parameter>blocking</parameter> parameter to &false;, in which
       case <function>msg_send</function> will immediately return &false; if the
       message is too big for the queue, and set the optional
       <parameter>errorcode</parameter> to <constant>MSG_EAGAIN</constant>,
       indicating that you should try to send your message again a little
       later on.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>errorcode</parameter></term>
     <listitem>
      <para>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
  <para>
   Upon successful completion the message queue data structure is updated as
   follows: <parameter>msg_lspid</parameter> is set to the process-ID of the
   calling process, <parameter>msg_qnum</parameter> is incremented by 1 and
   <parameter>msg_stime</parameter> is set to the current time.
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>msg_remove_queue</function></member>
    <member><function>msg_receive</function></member>
    <member><function>msg_stat_queue</function></member>
    <member><function>msg_set_queue</function></member>
   </simplelist>
  </para>
 </refsect1>  

</refentry>

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