What are common mistakes or errors to look out for when using PHP to process form submissions?

One common mistake when processing form submissions in PHP is not properly 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 from being executed. 

// Example of using prepared statements to process form submissions securely
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);
$stmt->execute();

Keywords

SQL injection cross-site scripting form validation error handling data sanitization

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