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run code in 150+ php & hhvm versions
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<?php $a = json_decode('{"3":{"friend":45,"all":100},"2":{"friend":30,"all":50},"1":{"friend":25,"all":25}}'); var_dump((array) $a); var_dump($a['3']); var_dump($a["3"]); var_dump($a[(string) 3]);
Output for 7.0.0 - 7.1.0
array(3) { ["3"]=> object(stdClass)#1 (2) { ["friend"]=> int(45) ["all"]=> int(100) } ["2"]=> object(stdClass)#3 (2) { ["friend"]=> int(30) ["all"]=> int(50) } ["1"]=> object(stdClass)#4 (2) { ["friend"]=> int(25) ["all"]=> int(25) } } Fatal error: Uncaught Error: Cannot use object of type stdClass as array in /in/Hr4cG:4 Stack trace: #0 {main} thrown in /in/Hr4cG on line 4
Process exited with code 255.
Output for hhvm-3.12.0
array(3) { ["3"]=> object(stdClass)#2 (2) { ["friend"]=> int(45) ["all"]=> int(100) } ["2"]=> object(stdClass)#3 (2) { ["friend"]=> int(30) ["all"]=> int(50) } ["1"]=> object(stdClass)#4 (2) { ["friend"]=> int(25) ["all"]=> int(25) } } Fatal error: Object does not implement ArrayAccess in /in/Hr4cG on line 4
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.6.28
array(3) { ["3"]=> object(stdClass)#2 (2) { ["friend"]=> int(45) ["all"]=> int(100) } ["2"]=> object(stdClass)#3 (2) { ["friend"]=> int(30) ["all"]=> int(50) } ["1"]=> object(stdClass)#4 (2) { ["friend"]=> int(25) ["all"]=> int(25) } } Fatal error: Cannot use object of type stdClass as array in /in/Hr4cG on line 4
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/Hr4cG on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/Hr4cG on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/Hr4cG on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/Hr4cG on line 2