PHP - Eliminar filas

DELETE FROM reservaciones WHERE fecha<=GETDATE()

$tod = date("y-m-j");

$sql1 = "DELETE FROM events WHERE email = '$usuario' AND end <= '$tod'";

$req1 = $link->prepare($sql1);

$req1->execute();

$tod = date("y-m-j");

$sql1 = "DELETE FROM events WHERE email = :usuario AND end <= :fecha";

$req1 = $link->prepare($sql1);

$req1->execute( array(':usuario'=>$usuario, ':fecha'=>$tod) );

$tod = date("y-m-j");

$sql1 = "DELETE FROM events WHERE email = '$usuario' AND end <= '$tod'";

$req1 = $link->prepare($sql1);

if ($req1->execute() === false) {

   echo "Error eliminando eventos: ".$req1->error;

}