PHP Read txt file and check if username password exists

Question

I have a bunch of passwords and usernames stored in a txt file and i need to check for matches. I know this is not a safe method but its for leaning purposes.

This code

Answer 1

Before you go ahead and try to correct this code, I strongly suggest you stay away from storing passwords in a plain text file. It is a huge security hole in your system.

Another architecture issue I can see is that your code would fail if the username or passwords contain a space in them. You probably should use line jumps as a delimiter instead (\n).