What security concerns should be considered when using PHP scripts for web forms?

One security concern when using PHP scripts for web forms is the risk of SQL injection attacks. To prevent this, it is important to sanitize and validate user input before using it in database queries. One way to do this is by using prepared statements with parameterized queries. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $username);
$stmt->execute();

Keywords

SQL injection cross-site scripting input validation CSRF protection secure coding practices

Related Questions