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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.pg-get-notify" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_get_notify</refname>
<refpurpose>Gets SQL NOTIFY message</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>array</type><type>false</type></type><methodname>pg_get_notify</methodname>
<methodparam><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>PGSQL_ASSOC</constant></initializer></methodparam>
</methodsynopsis>
<para>
<function>pg_get_notify</function> gets notifications generated by a
<literal>NOTIFY</literal> SQL command. To receive notifications,
the <literal>LISTEN</literal> SQL command must be
issued.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>connection</parameter></term>
<listitem>
&pgsql.parameter.connection;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
&pgsql.parameter.mode;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
An <type>array</type> containing the <literal>NOTIFY</literal> message name and backend PID.
If supported by the server, the array also contains the server version and the payload.
Otherwise if no <literal>NOTIFY</literal> is waiting, then &false; is returned.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&pgsql.changelog.connection-object;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>PostgreSQL NOTIFY message</title>
<programlisting role="php">
<![CDATA[
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "An error occurred.\n";
exit;
}
// Listen 'author_updated' message from other processes
pg_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!$notify) {
echo "No messages\n";
} else {
print_r($notify);
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pg_get_pid</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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