What are some common pitfalls to avoid when writing PHP code for database interactions in a form?

One common pitfall to avoid when writing PHP code for database interactions in a form is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements with parameterized queries to securely interact with the database. 

// Connect to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a statement with a parameterized query
$stmt = $pdo->prepare('INSERT INTO users (username, email) VALUES (:username, :email)');

// Bind parameters and execute the statement
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);
$stmt->execute();

Keywords

SQL injection prepared statements PDO mysqli data validation

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