- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?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]);