When doing complex applications it's often nice to have some sort of system for handling settings. PHP has a nice function called parse_ini_file which can be used to create a basic but still usable setting file feature. A simple class which loads the configuration file and offers some methods to retrieve the values for a given key is all that's needed.

His example code gives a sample ini file with database connection information and a MyConfigClass that parses the file and can get or set values in it.