How does the use of dynamic salts enhance security in PHP encryption?

Using dynamic salts in PHP encryption enhances security by adding an extra layer of randomness to the encryption process. This makes it harder for attackers to crack the encryption by brute force or rainbow table attacks. Dynamic salts ensure that each encryption operation generates a unique result, even if the same plaintext is encrypted multiple times.

// Generate a random salt for encryption
$salt = openssl_random_pseudo_bytes(16);

// Encrypt the data using the generated salt
$encrypted_data = openssl_encrypt($data, 'AES-256-CBC', $encryption_key, 0, $salt);

// Store the salt along with the encrypted data
$stored_data = base64_encode($salt) . ':' . $encrypted_data;