Chapter 12. Working with Files and Directories

Testing for the existence of files, plus reading to them and writing to from them, are important features of any rich programming language. PHP is no exception, as it provides you with functions that make these processes fairly straightforward. 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 files

• How to write or append to a file

• How to lock a file

• How to work with directories