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file_get_contents(): Filename cannot be empty (uploading files to be optional)

 
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Hello everyone! I am a php newbie and still learning. I made a simple upload form in php. This is my code.


It works fine. But if I press the submit with no files attached, it displays the error, Warning: file_get_contents(): Filename cannot be empty in C:\xampp\htdocs\contractdb\filetest.php on line 20 .

I want uploading files to be optional because not every user has the files to attach. I also want the user to download the files after uploading (if they do upload files) without removing file_get_contents($_FILES['upload']['tmp_name']).

How do I do this?
 
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