How can PHP code readability and maintainability be improved in the provided code snippet?

The provided code snippet lacks proper indentation and spacing, making it difficult to read and maintain. To improve readability and maintainability, we can add consistent indentation, spacing, and comments to clearly explain the purpose of each section of code. 

<?php

// Retrieve user input from form
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];

// Validate user input
if (empty($username) || empty($email) || empty($password)) {
    die("Please fill out all fields.");
}

// Sanitize user input
$username = filter_var($username, FILTER_SANITIZE_STRING);
$email = filter_var($email, FILTER_SANITIZE_EMAIL);
$password = password_hash($password, PASSWORD_DEFAULT);

// Store user data in database
$query = "INSERT INTO users (username, email, password) VALUES ('$username', '$email', '$password')";
$result = mysqli_query($connection, $query);

if ($result) {
    echo "User registered successfully.";
} else {
    echo "Error registering user.";
}

?>

Keywords

code readability maintainability PHP refactoring coding standards

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