What are some potential security risks or vulnerabilities when using user input (such as email addresses) to interact with a PHP script that involves database operations?

One potential security risk when using user input in a PHP script for database operations is SQL injection. To prevent this, always sanitize and validate user input before using it in database queries. Use prepared statements with parameterized queries to securely interact with the database. 

// Sanitize and validate user input
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Prepare a SQL statement using a prepared statement
$stmt = $pdo->prepare("SELECT * FROM users WHERE email = :email");
$stmt->bindParam(':email', $email);
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

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

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