PHP Decoding Array Within Json Object -

i stuck json data:

i have info in variable:

$mydata= '{"success":true,"data":[{"sku":203823,"issoldout":false,"isshowdiscount":false,"discount":0,"currencycode":"usd","currencysymbol":"us$","price":"10.20","listprice":"","adddate":"4/23/2013"}]}'; 

i have managed tell if success true or not doing this:

$obj = json_decode($mydata, true);  if ($obj['success'] != 1) {     print 'does not exist<br />'; } else{     print $obj['success']."<br/>"; } 

where echo $obj['success']; equal 1 if true , 0 if false.

what getting me stuck how @ keys in "data":[] array.

i tried print $obj['data'][0]; , print $obj['data']['sku']; both returned nothing.

any ideas on how info out welcomed.

$data array so:

echo $obj['data']; should print "array"

echo $obj['data'][0]['sku']; should print "203823"