Develop a web application using PHP that receives submission files for completed assignments. The application has the following requirements:

1. At least four different papers (e.g., 159339, 159741, 159302, 159334)
2. The account numbers for students need to be checked against a list (the list must reside in a text file in the same subdirectory.
3. Every time a student submits a file, it has to check against his/her password