Description:
------------
In an associative array with number as text keys, the keys can not be used to get the values. "Foreach" works.

  var_dump($choices);      
// array(2) { ["1"]=>  array(2) { [0]=>  string(1) "0" [1]=>  string(1) "1" } ["0"]=>  array(2) { [0]=>  string(1) "0" [1]=>  string(1) "1" } }

  var_dump($choices['1']); // NULL
  var_dump($choices[1]);   // NULL
  var_dump($choices["1"]); // NULL
  var_dump($choices->{1}); // NULL
  var_dump($choices->{'1'});//NULL
  var_dump($choices['0']);  //NULL
  var_dump($choices[0]);    //NULL

 foreach ($choices as $k => $v) {
    var_dump($k, $v);
  }

// string(1) "1" array(2) { [0]=> string(1) "0" [1]=> string(1) "1" }
// string(1) "0" array(2) { [0]=> string(1) "0" [1]=> string(1) "1" }


Reproduce code:
---------------
$db_data_model='{"events":{"1":"film","0":"avatar"},"times":{"0":"2010-10-09 08:00","2":"2010-10-09 11:00","3":"2010-09-09"},"choices":{"1":["0","1"],"0":["0","1"]}}';
$model = json_decode($db_data_model);
$choices = (array)$model->choices;
var_dump($choices);
var_dump($choices['1']); // NULL
var_dump($choices[1]);   // NULL
var_dump($choices->{1}); // NULL
var_dump($choices->{'1'});//NULL

foreach ($choices as $k => $v) {
    var_dump($k, $v);
}



Expected result:
----------------
var_dump($choices['1']);

// array(2) { [0]=> string(1) "0" [1]=> string(1) "1" }

var_dump($choices['0']);

// array(2) { [0]=> string(1) "0" [1]=> string(1) "1" }

Actual result:
--------------
var_dump($choices['1']);

// NULL

var_dump($choices['0']);

// NULL