3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = json_decode('{"3":{"friend":45,"all":100},"2":{"friend":30,"all":50},"1":{"friend":25,"all":25}}'); $b = 3; var_dump($a->$b); /*var_dump($a['3']); var_dump($a["3"]); var_dump($a[(string) 3]);*/

preferences:
34.58 ms | 402 KiB | 5 Q