What are some common pitfalls to avoid when designing a customer database in PHP?

One common pitfall to avoid when designing a customer database in PHP is not sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements and parameterized queries when interacting with the database. 

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

// Prepare a statement
$stmt = $pdo->prepare('SELECT * FROM customers WHERE id = :id');

// Bind parameters
$stmt->bindParam(':id', $_GET['id']);

// Execute the query
$stmt->execute();

// Fetch the results
$customer = $stmt->fetch();

Keywords

SQL injection data validation normalization indexing foreign keys

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