File Handling in PHP

PHP can work with files for logs, uploads, and configs. ## Read file ```php $content = file_get_contents("data.txt"); echo $content; ``` ## Write file ```php file_put_contents("log.txt", "Hello ", FILE_APPEND); ``` ## Check if file exists ```php if (file_exists("data.txt")) { echo "Found"; } ``` ## Security tip Never allow users to choose file paths directly. > Next: Uploading files from forms.