php - base64 encoded data is lost after json_encode

Question

I use the following code to generate a encrypted string for a given string.

class MY_class{
    public static function cryption($string){
        $output = base64_encode(openssl_encrypt($string, $cipher_method, $key, 0, $iv));
        $output = $iv . $output;
        return $output;
    }
}

Using this code I generated the encrypted id of the id of a model object and replaced the original id.

$Model_object = Model_class::find(1);
$Model_object->id = MY_class::cryption($Model_object->id);
echo json_encode($Model_object);

For a given instance print_r() of $Model_object after replacing the original id with encrypted id gives me the following result.

[index] => Array
    (
        [id] => 4df73f34cUYxVmVLWlFUU2M9
    )

But json_encode() only outputs only the first decimal digits of the of the encrypted id.

{"id":4}

I'd really appreciate if someone can explain why this is happening and how to overcome this problem.

P.S. I have already googled this problem and searched in Stack Overflow too. So, don't mention it in comments.

Answer 1

As @LSerni said, I was implicitly assigning the encrypted id which is a string to the integer property $Model_object->id.

So I created a new dynamic property $Model_object->encrypted_id and assigned the encrypted id to it and called that property on the other side. It worked like a charm.

Thank you very much @LSerni for your insight on the problem.