laravel-5.8:Invalid argument supplied for foreach() - laravel

Question

hi I make a form to upload pics in Laravel but when I open the form then it shows error: Invalid argument supplied for foreach()
blade file:
<form method="POST" action="{{ route('admin.product.alternateimages') }}" enctype="multipart/form-data" class="add-new-post">
#csrf
<strong class="text-muted d-block mb-2 mt-5">Upload Product Image</strong>
<div class="input-group mb-3">
<div class="input-group input-group-seamless">
<input type="file" name="product_alt_img[]" class="form-control mb-2 btn btn-sm btn-outline-primary mr-1 #error('product_image') is-invalid #enderror" value="{{ old('product_image') }}" id="" placeholder=""> </div>
#error('product_image')
<div class="small text-danger">{{ $message }}</div>
#enderror
</div>
</form>
function:
public function alternateimages(Request $request)
{
$altimgs = new Product;
$altimgs->product_id = $request->product_id;
$files = $request->file('product_alt_img');
foreach ($files as $file) {
$images = $file->getClientOriginalName();
$file->move(public_path('images/backend_images/product_images'), $images);
$altimgs->product_alt_img = $images;
}
$altimgs->save();
return redirect()->back()->with('flash_message_success', 'Product Images has been added successfully');
}

Answer 1

You may have to change product_alt_img[] to product_alt_img if you are uploading a single file.
<input type="file" name="product_alt_img" class="form-control mb-2 btn btn-sm btn-outline-primary mr-1 #error('product_image') is-invalid #enderror" value="{{ old('product_image') }}" id="" placeholder="">
Else if wish to upload multiple file, you may have to modify your controller method.
public function alternateimages(Request $request)
{
$altimgs = new Product;
$altimgs->product_id = $request->product_id;
//fetch an array of product_alt_img
$files = $request->product_alt_img;
//go over each Illuminate\Http\UploadedFile instance
foreach($files as $file)
{
$image = $file->getClientOriginalName();
....
}
....
}
NB: A more eloquent solution is to have a separate table for storing products images