how to decrypt an array of data after encrypting – php

Am trying to encrypt and decrypt user data when they login or input some data in my website using php and am able to encrypt it using this

function encryptData($data, $key) {
    $enKey = base64_decode($key);
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
    $encrypted = openssl_encrypt($data, 'aes-256-cbc', $enKey, 0, $iv);
    return base64_encode($encrypted.'::'.$iv);
}

and then decrypt it using this too

function decryptData($data, $key) {
    $enKey = base64_decode($key);
    list($encrypted_data, $iv) = array_pad(explode('::', base64_decode($data), 2), 2, null);
    return openssl_decrypt($encrypted_data, 'aes-256-cbc', $enKey, 0, $iv);
}

If i want to get a particular data it is easier to decrypt and show to user but when the data comes in an array how do i go about decrypting it Like

    $data = array();
    $sql = $conn->prepare("SELECT * FROM user_feedback");
    $sql->execute();
    $res = $sql->get_result();
    if (mysqli_num_rows($res) > 0) {
        while ($row = $res -> fetch_assoc()) {
            $data[] = $row;
        }


        echo decryptData(json_encode($data[0]['feedback']), $key); //It works like this for single data
        echo decryptData(json_encode($data), $key); //but how do i do it like this


    }
    else {
        echo json_encode("NO_DATA");
    }