What are some common pitfalls when using PHP for form validation and submission?

One common pitfall when using PHP for form validation and submission is not sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To solve this, always use prepared statements or parameterized queries when interacting with your database to prevent malicious input. 

// Example of using prepared statements to prevent SQL injection

// Establish a database connection
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare a SQL statement
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");

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

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

Keywords

SQL injection cross-site scripting empty fields form validation error handling

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