What are the potential security risks associated with using PHP for form processing and data validation?

One potential security risk associated with using PHP for form processing and data validation is the possibility of SQL injection attacks if user input is not properly sanitized. To mitigate this risk, developers should use prepared statements or parameterized queries to interact with databases, instead of directly inserting user input into SQL queries. 

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->execute(['username' => $username]);
$user = $stmt->fetch();

Keywords

SQL injection cross-site scripting data sanitization input validation CSRF protection

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