The password

123

will be encrypted and then decrypted back with

AES-128-ECB

encryption algorithm. Encrypts the text using the secret key

sec key

function encrypt_text($text, $secret_key)
{
    return openssl_encrypt($text,"AES-128-ECB", $secret_key);
}

Decrypts encrypted text (first parameter) using the secret key (second parameter)

function decrypt_text($encrypted_string, $secret_key)
{
    return openssl_decrypt($encrypted_string,"AES-128-ECB", $secret_key);
}

Calls the above two functions to perform encryption and decryption

// Secret key, that is used to encrypt and decrypt the 
$text
 content
$secret = 'sec key';

// the text that we want to encryption and decryption
$text = '123';

$password_encrypted = encrypt_text($text, $secret);
$password_decrypted = decrypt_text($password_encrypted, $secret);

echo 'Encrypted text: ' . $password_encrypted . '<br>';
echo 'Decrypted password: ' . $password_decrypted;