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run code in 150+ php & hhvm versions
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<?php $json = '{ "0" : "test1" }'; $obj = json_decode($json); var_dump($obj); $array = (array) $obj; var_dump($array); echo $array['0'], ' ', $array[0];
based on YMmRe
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["0"]=> string(5) "test1" } array(1) { ["0"]=> string(5) "test1" } Notice: Undefined offset: 0 in /in/1eU8s on line 7 Notice: Undefined offset: 0 in /in/1eU8s on line 7
Output for hhvm-3.12.0
object(stdClass)#1 (1) { ["0"]=> string(5) "test1" } array(1) { ["0"]=> string(5) "test1" } Notice: Undefined index: 0 in /in/1eU8s on line 7 Notice: Undefined index: 0 in /in/1eU8s on line 7
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
object(stdClass)#1 (1) { ["0"]=> string(5) "test1" } array(1) { ["0"]=> string(5) "test1" } Notice: Undefined index: 0 in /in/1eU8s on line 7 Notice: Undefined offset: 0 in /in/1eU8s on line 7
Output for 5.2.0 - 5.2.17
object(stdClass)#1 (1) { ["0"]=> string(5) "test1" } array(1) { ["0"]=> string(5) "test1" } Notice: Undefined index: 0 in /in/1eU8s on line 7 Notice: Undefined offset: 0 in /in/1eU8s on line 7
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/1eU8s on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/1eU8s on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/1eU8s on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/1eU8s on line 3