PHP - no me lista todos los resultados, solo el primero mysqli

$result=$conexion->query("SELECT tabla FROM assets LIMIT 0,30");

$row = $result->fetch_array(MYSQLI_NUM);

print_r($row);

$result=$conexion->query("SELECT tabla FROM assets LIMIT 0,30");

while($row = $result->fetch_array()){

    print_r($row);

}

while($row = $result->fetch_array()){

   $array[]=$row[0];

}