File System Operations

PHP provides convenient functions to read and write files directly in a single line, making it easy to manage files on the server:

• file_put_contents(): Writes a string to a file, creating the file if it does not exist.
• file_get_contents(): Reads the entire contents of a file into a string.
• file_exists(): Verifies if a file exists on the server before trying to read it, preventing runtime errors.

Let's run a program writing text to a file, verifying its existence, and reading it back:

<?php
$file = "demo.txt";

// Write content to file
file_put_contents($file, "PHP File operations are simple and elegant!");

// Verify file exists before reading
if (file_exists($file)) {
    $content = file_get_contents($file);
    echo "File Content: " . $content . "\n";
} else {
    echo "Error: File does not exist!\n";
}
?>