Exemple :
$dbs2 = $dbh->prepare('SELECT * FROM Commune
WHERE com_nom = ? OR com_dept =?');
$dbs2->execute(array("Grobourg","76"));
$dbs3 = $dbh->prepare('SELECT * FROM Commune
WHERE com_nom = :commune OR com_dept = :dept');
$dbs3->execute(array(':commune' => 'Grobourg', ':dept' => 'GRD'));