Распарсить json в php

$str = '{"1":{"hdate":"1","duedate":"1","rub":"3","eur":"1","debit":"2","credit":"3","balanse":"3"}}';
$jdecode = json_decode($str);
var_dump($jdecode);

Результат:

object(stdClass)[1]
  public '1' => 
    object(stdClass)[2]
      public 'hdate' => string '1' (length=1)
      public 'duedate' => string '1' (length=1)
      public 'rub' => string '3' (length=1)
      public 'eur' => string '1' (length=1)
      public 'debit' => string '2' (length=1)
      public 'credit' => string '3' (length=1)
      public 'balanse' => string '3' (length=1)

<?php
$json = '{  
   "1":{  
      "hdate":"1",
      "duedate":"1",
      "rub":"3",
      "eur":"1",
      "debit":"2",
      "credit":"3",
      "balanse":"3"
   }
}';
$obj = json_decode($json);
print $obj->{'1'}->hdate;