What are the potential security risks when inserting user input into a database using PHP?

When inserting user input into a database using PHP, one potential security risk is SQL injection. This occurs when a user input is not properly sanitized, allowing malicious SQL code to be executed. To prevent this, always use prepared statements with parameterized queries to sanitize user input before inserting it into the database. 

// Connect to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with a named parameter
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");

// Bind the sanitized user input to the named parameters
$stmt->bindParam(':username', $_POST['username']);
$stmt->bindParam(':email', $_POST['email']);

// Execute the query
$stmt->execute();

Keywords

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

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