PHP - Conexion PDO a Mysqli

try

{

	$bdd = new PDO('mysql:host=localhost;dbname=basededatos;charset=utf8', 'usuario', 'contrasena');

}

catch(Exception $e)

{

        die('Error : '.$e->getMessage());

}

$sql = "SELECT title, start, end, color, estado_reparaciones FROM reparaciones_vehiculos WHERE placa_reparaciones='$placaw'";

$req = $bdd->prepare($sql);

$req->execute();

$events = $req->fetchAll();

$mysqli=new mysqli('localhost', 'usuario', 'contrasena', 'basededatos');

	if(mysqli_connect_errno()){

		echo 'Conexion Fallida : ', mysqli_connect_error();

		exit();

	}

		$sql = "SELECT title, start, end, color, estado_reparaciones FROM reparaciones_vehiculos WHERE placa_reparaciones='$placaw'";

		$result=$mysqli->query($sql);

		$events = $result->num_rows;

[19-Feb-2024 08:26:33 America/Bogota] PHP Warning:  Invalid argument supplied for foreach() in /home1/gytgruasytranspo/public_html/sistema/vehiculos/calendario2/index.php on line 222

<?php foreach($events as $event):

				$start = explode(" ", $event['start']);

				$end = explode(" ", $event['end']);

				if($start[1] == '00:00:00'){

					$start = $start[0];

				}else{

					$start = $event['start'];

				}

				if($end[1] == '00:00:00'){

					$end = $end[0];

				}else{

					$end = $event['end'];

				}

			?>

				{

					id: '<?php echo $event['id']; ?>',

					title: '<?php echo $event['title']; ?>',

					start: '<?php echo $start; ?>',

					start2: '<?php echo fechaCastellano($start); ?>',

					hora1: '<?php echo substr($start, -8, -3); ?>',

					end: '<?php echo $end; ?>',

					end2: '<?php echo fechaCastellano ($end); ?>',

					hora2: '<?php echo substr($end, -8, -3); ?>',

	                estado_reparaciones: '<?php echo $event['estado_reparaciones']; ?>',

					color: '<?php echo $event['color']; ?>',

				},

			<?php endforeach; ?>

$events = $result->num_rows;

$events = $req->fetchAll();