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[web] Keeping track of entires

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Hi, I'm creating php scripts for my school so that the teachers can login and add classes to the database(text files). What I want is, for when there are NO classes in the database, a message saying, "there currently are no classes scheduled." The problem is I have to create another seperate file just to hold the class count and check that text file everytime i want to read from the classes database file. My question is, is there any other way to count the number of entires in the text without creating a separate text file to keep track of them? thanks.

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