File Reading and Writing Basics

In this lesson you will learn the basics of reading and writing files with file_put_contents and file_get_contents. This is for anyone searching for "PHP file read write".

file_put_contents() writes a string to a file and file_get_contents() reads one back. Saving configuration files and logs makes this a basic operation you will use often. Completing a file operation in a single function call is characteristically PHP.

The sample code writes two lines of text with file_put_contents("memo.txt", "Hello\nThis is line 2") and reads them back with file_get_contents("memo.txt"). Notice how these two functions alone cover basic file work.

A common stumbling block for beginners is writing code that ignores the possibility of failure. A missing file makes these functions return false, so checking the return value is the safe habit. In practice you must always allow for failures such as writing to a location you lack permission for.

Checking the return value for the missing-file case makes your file handling far more robust. Recording logs and managing configuration files are daily work in real PHP applications.