What are some common security risks associated with handling user input in PHP applications?

One common security risk associated with handling user input in PHP applications is the possibility of SQL injection attacks. To prevent this, developers should always use prepared statements with parameterized queries when interacting with databases. 

// 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 (XSS) input validation prepared statements security tokens

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