What are the recommended steps for debugging PHP code that involves form submissions and database queries to ensure proper functionality?

Issue: When debugging PHP code that involves form submissions and database queries, it's important to check for errors in the form data being submitted and the SQL queries being executed. To ensure proper functionality, validate the form data before processing it and use prepared statements for database queries to prevent SQL injection attacks. PHP Code Snippet: 

// Validate form data
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Validate name and email fields
    if (empty($name) || empty($email)) {
        echo "Name and email are required fields";
        exit;
    }
    
    // Sanitize form data
    $name = filter_var($name, FILTER_SANITIZE_STRING);
    $email = filter_var($email, FILTER_SANITIZE_EMAIL);
    
    // Process form data
    // Your code to insert data into the database goes here
}

// Use prepared statements for database queries
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

Xdebug SQL injection error logging form validation PDO

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