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<?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]);*/
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/b9PCd
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'json_decode'
         1        SEND_VAL                                                 '%7B%223%22%3A%7B%22friend%22%3A45%2C%22all%22%3A100%7D%2C%222%22%3A%7B%22friend%22%3A30%2C%22all%22%3A50%7D%2C%221%22%3A%7B%22friend%22%3A25%2C%22all%22%3A25%7D%7D'
         2        DO_ICALL                                         $2      
         3        ASSIGN                                                   !0, $2
   3     4        ASSIGN                                                   !1, 3
   4     5        INIT_FCALL                                               'var_dump'
         6        FETCH_OBJ_R                                      $5      !0, !1
         7        SEND_VAR                                                 $5
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0