What are the best practices for securely handling user data in PHP applications?

To securely handle user data in PHP applications, it is important to sanitize and validate input data to prevent SQL injection and other attacks. Use parameterized queries when interacting with databases to avoid SQL injection vulnerabilities. Additionally, store sensitive data securely by hashing passwords using strong cryptographic algorithms and encrypting data when necessary. 

// Sanitize and validate user input
$clean_input = filter_input(INPUT_POST, 'input_field', FILTER_SANITIZE_STRING);

// Use parameterized queries to interact with the database
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $clean_input);
$stmt->execute();

// Hash passwords using PHP's password_hash function
$hashed_password = password_hash($clean_input, PASSWORD_DEFAULT);

// Encrypt sensitive data using OpenSSL
$encrypted_data = openssl_encrypt($clean_input, 'AES-256-CBC', 'encryption_key', 0, 'encryption_iv');

Keywords

SQL injection password hashing encryption input validation session management

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