PHP：unserialize（）不返回数组

Question

I have this code below to insert serialized data in a field (order_pictures):

  $pictures_id = unserialize($category->getOrderPictures());
  array_push($pictures_id, $picture->getId());
  $category->setOrderPictures(serialize($pictures_id));

It works ok the first time I execute it. At least, it stores b:0; in the order_pictures field.

But when I execute it again, the value of $pictures_id is bool(false), and I expected an array type.

Any idea?

Regards

Javi

Answer 1

Your problem is that you're trying to unserialize the contents of $category->getOrderPictures() before it's ever been initialized, so $pictures_id is getting boolean false in it, which is the result of unserialize failing. Then the array_push() is failing because $pictures_id isn't an array.

Try this:

$pictures_id = $category->getOrderPictures();
if($pictures_id)
    $pictures_id = unserialize($pictures_id);
else
    $pictures_id = array();
array_push($pictures_id, $picture->getId());
$category->setOrderPictures(serialize($pictures_id));