<?xml version="1.0" encoding="iso-8859-1"?>
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<refentry xml:id="function.pg-get-pid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_get_pid</refname>
  <refpurpose>Gets the backend's process ID</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_get_pid</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_get_pid</function> gets the backend's (database server
   process) PID. The PID is useful to determine whether or not a <literal>NOTIFY</literal>
   message received via <function>pg_get_notify</function> is sent from another process
   or not.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      <para>
       PostgreSQL database connection resource.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The backend database process ID.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>PostgreSQL backend PID</title>
    <programlisting role="php">
<![CDATA[
<?php 
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occured.\n";
  exit;
}

// Backend process PID. Use PID with pg_get_notify()
$pid = pg_get_pid($conn);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_get_notify</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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