php - numeric Json decode not work -

i have below json code

 {"1":1,"5":1} 

when decode above json got object array using below php statement.

$array_val = (array)json_decode($price); 

i got below array.

array (   [1] => 1   [5] => 1 ) 

but below statement not work

echo $array_val[1]; 

the below error occurred.
undefined offset: 1

how resolve issue?

try demo

php

$json = '{"1":1,"5":1}'; $array_val=json_decode($price, true); echo $array_val[1]; 

output :

1