sync with reference.xml r1.59

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@249286 c90b9560-bf6c-de11-be94-00142212c4b1

reference/pdo/connections.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 
 <chapter xml:id="pdo.connections" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Connections and Connection management</title>
@@ -109,6 +109,15 @@ $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass, array(
    </programlisting>
   </example>
  </para>
+ <note>
+  <para>
+   If you wish to use persistent connections, you must set
+   <constant>PDO::ATTR_PERSISTENT</constant> in the array of driver options
+   passed to the PDO constructor. If setting this attribute with
+   <xref linkend="function.PDO-setAttribute" /> after instantiation of the
+   object, the driver will not use persistent connections.
+  </para>
+ </note>
  <note>
   <para>
    If you're using the PDO ODBC driver and your ODBC libraries support ODBC