Sams Teach Yourself PHP, MySQL and Apache in 24 Hours

Testing, reading, and writing to files are staple activities for any full-featured programming language. PHP is no exception, providing you with functions that make the process straightforward. In this hour, you will learn

• How to include files in your documents

• How to test 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