Testing for the existence of files, plus reading from them and writing to them, are important features of any rich programming language. PHP is no exception in that it provides functions that make these processes straightforward. Additionally, because PHP, Apache, and MySQL are not the only applications on your machine, there might come a time when you need to access those other applications from within your PHP code; elements in this chapter show you how to access other applications from within your PHP code. In this chapter, you will learn
How to include other files in your documents
How to test for the existence of files and directories
How to open a file before working with it
How to read data from ...