The "Rank and File" tutorial shows how to use PHP to read data from a file. The PHP code opens the file, reads the data, and closes the file. Here is a link to one of the examples in this tutorial that involves reading a recipe from a text file and displaying it.
The "Databases and other Animals" tutorial shows how to use PHP and MySQL together it create and add information into a database. It goes through many different ways on how PHP can be used to access a database and run queries. Here is a link to the example in this tutorial that accesses a MySQL database and selects the information stored to display it.
