Undefined variable: image_name Laravel 5.4 - php

Question

I want to upload and display image, but i get error
Undefined variable: image_name
This is my controller
$supply = new DataSupplyProcess;
if($request->hasFile('supply_photo')){
$photo = Validator::make($request->all(), [
'supply_photo' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048',
]);
if($photo->fails()){
return redirect()->back()->with('warning', 'Image size should be 2MB or less');
}
$image = $request->file('supply_photo');
$image_name = rand().'.'. $image->getClientOriginalExtension();
$destination_path = public_path('/item');
$image->move($destination_path, $image_name);
//dd($image);
}
$supply->item = $request->item;
$supply->supply_details = $request->supply_details;
$supply->tgl_request_date = $request->tgl_need_date;
$supply->tgl_need_date = $request->tgl_need_date;
$supply->employee_id = $id;
$supply->id_approved_by = $manager->employee_manager_id;
$supply->is_approved = 0;
$supply->is_final_approved = 0;
$supply->supply_photo = $image_name;
$supply->save();
This Is My View
<label for="supply_photo">Photo</label>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" class="form-control" name="supply_photo">

Answer 1

In your controller, try something like:
if(Input::file('supply_photo') !== null){
$photo = Validator::make($request->all(), [
'supply_photo' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048',
]);
...
}
I think this post can provide more info

Answer 2

when ever you pass variable like this with IF condition assign default value first.
so you won't get error if image not selected.
and in your cause check first you get image or not
dd($image = $request->file('supply_photo'));
$image_name = NULL;
if($request->hasFile('supply_photo')){
$image = $request->file('supply_photo');
$image_name = rand().'.'. $image->getClientOriginalExtension();
$destination_path = public_path('/item');
$image->move($destination_path, $image_name);
}
$supply->supply_photo = $image_name;
$supply->save();

Answer 3

$supply = new DataSupplyProcess;
if($request->hasFile('supply_photo')){
$photo = Validator::make($request->all(), [
'supply_photo' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048',
]);
if($photo->fails()){
return redirect()->back()->with('warning', 'Image size should be 2MB or less');
}
//$original_name=$request->file('supply_photo')->getClientOriginalName();
//$size=$request->file('supply_photo')->getSize();
$extension=$request->file('supply_photo')->getClientOriginalExtension();
$filename=uniqid().'.'.$extension;
$imagepath=url('/item/'.$filename);
$path=$request->file('supply_photo')->storeAs(public_path('/item'),$filename);
}