Are there any potential security risks to consider when implementing input validation against a database in PHP?

When implementing input validation against a database in PHP, one potential security risk to consider is SQL injection. This can occur when user input is not properly sanitized before being used in SQL queries, allowing malicious users to manipulate the query to access or modify data in the database. To mitigate this risk, it is important to use parameterized queries or prepared statements to safely handle user input. 

// Example of using prepared statements for input validation
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->execute(['username' => $username]);
$user = $stmt->fetch();

Keywords

SQL injection data sanitization prepared statements cross-site scripting input filtering

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