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<?php
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
?>

<?php
try {
    $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
    foreach($dbh->query('SELECT * from FOO') as $row) {
        print_r($row);
    }
    $dbh = null;
} catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
}
?>

<?php
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass);
// Use the connection here

// Now that the script is done, close the connection
$dbh = null;
?>

<?php
$dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass, array(
    PDO::ATTR_PERSISTENT => true
));
?>