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Hi, I'm trying to pass an array in an hidden field, serializing it, but I got nothing when I unserialize it.

I serialize a parameter and pass it in an hidden field,  in this way:

$arr_hidden_ids=base64_encode(serialize($arr_id));

 (where "$arr_id" is an array of id).

Pass the hidden field to Smarty:

$this->smarty->assign('hidden_ids', $this->CreateInputHidden($id, 'hidden_ids[]',$arr_hidden_ids ));

In the source of the generated page I have:

then, I decode and unserialize the parameter when receiving the submitted form:

$arr_hidden_ids=base64_decode(unserialize($params['hidden_ids']));
print_r($arr_hidden_ids);

It prints nothing.


If I don't decode/unserialize,

$arr_hidden_ids=$params['hidden_ids'];
print_r($arr_hidden_ids);

It prints:

Array ( [0] => YToyOntpOjA7czoyOiIxMCI7aToxO3M6MToiOSI7fQ== )

Why? What am I doing wrong?

Thanks

Maybe this
in stead of

I tried your suggestion but $arr_hidden_ids is still empty after decode..

With debug=true in config.php, I receive this warning:

Warning: base64_decode() expects parameter 1 to be string, array given in (...where I try to unserialize the $params['hidden_ids']).

I have found the trick:

// When unserializing/decoding
$arr_hidden_ids=unserialize(base64_decode($params['hidden_ids']));

// The variable used for query the db, has to be unserialized/decoded again. So I've created a new one
$arr_hidden_ids_FOR_QUERY=unserialize(base64_decode($arr_hidden_ids));

//Pass to Smarty
$this->smarty->assign('hidden_ids', $this->CreateInputHidden($id, 'hidden_ids',base64_encode(serialize($arr_hidden_ids)) ));

Thank you Jos, You put me on the right way.