When developing PHP applications that handle sensitive user data, what are the best practices for ensuring secure database interactions and preventing common security vulnerabilities?

When developing PHP applications that handle sensitive user data, it is crucial to ensure secure database interactions and prevent common security vulnerabilities such as SQL injection attacks. One of the best practices is to use prepared statements with parameterized queries to sanitize user input and prevent malicious SQL queries from being executed. 

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with placeholders for user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

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

// Execute the prepared statement
$stmt->execute();

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

Keywords

SQL injection prepared statements PDO encryption cross-site scripting

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