<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pg-version" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_version</refname>
  <refpurpose>
   Returns an array with client, protocol and server version (when available)
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>pg_version</methodname>
   <methodparam choice="opt"><type class="union"><type>PgSql\Connection</type><type>null</type></type><parameter>connection</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_version</function> returns an array with the client, protocol
   and server version. Protocol and server versions are only available if PHP
   was compiled with PostgreSQL 7.4 or later.
  </para>
  <para>
   For more detailed server information, use <function>pg_parameter_status</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &pgsql.parameter.connection-with-nullable-default;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array with <literal>client</literal>, <literal>protocol</literal> 
   and <literal>server</literal> keys and values (if available).
  </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;
     <row>
      <entry>8.0.0</entry>
      <entry>
       <parameter>connection</parameter> is now nullable.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_version</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
  $dbconn = pg_connect("host=localhost port=5432 dbname=mary")
     or die("Could not connect");
     
  $v = pg_version($dbconn);
  
  echo $v['client'];
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
7.4
]]>
    </screen>
   </example>
  </para>
 </refsect1>

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