get value from json php codeigniter -

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i have json object like 

[   [     {       "class":"com.ehealth.data.sample_data",       "collectedby":"2013-07-21",       "collecteddate":"kamal",       "orderid":2,       "sampleid":2.897033553e9     },     {       "class":"com.ehealth.data.order_data",       "doctorusername":"kamal",       "duedate":"2014-01-02",       "orderdate":"2013-12-12",       "orderid":2,       "patientid":"p0001",       "prority":1,       "status":"complete",       "testtype":"fasting blood sugar"     }   ],   [     {       "class":"com.ehealth.data.sample_data",       "collectedby":"2013-07-22",       "collecteddate":"kamal",       "orderid":3,       "sampleid":5.978956192e9     },     {       "class":"com.ehealth.data.order_data",       "doctorusername":"kamal",       "duedate":"2014-01-02",       "orderdate":"2013-12-12",       "orderid":3,       "patientid":"p0001",       "prority":2,       "status":"complete",       "testtype":"fasting blood sugar"     }   ] ]

and decode php array

$data['query'] = json_decode($curl_response);

i try access valuse 

foreach ($query $row) {     echo $row->sampleid;            }

but when going access the values inside can not access error 

a php error encountered  severity: notice  message: trying property of non-object

can me. dont know do

you can it:

foreach ($query $row) {    echo $row[0]->sampleid;            }

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