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How do use it at PDO? PDO have PDO::ATTR_PERSISTENT. We set in the PDO constructor:

<?php
// configuration
$dbtype		= "sqlite";
$dbhost 	= "localhost";
$dbname		= "test";
$dbuser		= "root";
$dbpass		= "admin";

// database connection
$conn = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass, array(PDO::ATTR_PERSISTENT => true));

// query
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "SELECT * FROM books";
$q = $conn->query($sql) or die("ERROR: " . implode(":", $conn->errorInfo()));

$r = $q->fetch(PDO::FETCH_ASSOC);

print_r($r);

?>

Please, look at line 10.