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<?php $o = new stdClass(); $b = 'a'; $o->a = array ( 'foo' => 1, 'bar' => 2 ); var_dump($o->{$b}['foo']); var_dump($o);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/9dRhi
function name:  (null)
number of ops:  15
compiled vars:  !0 = $o, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $2      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
    4     3        ASSIGN                                                   !1, 'a'
    5     4        ASSIGN_OBJ                                               !0, 'a'
    6     5        OP_DATA                                                  <array>
   10     6        INIT_FCALL                                               'var_dump'
          7        FETCH_OBJ_R                                      ~7      !0, !1
          8        FETCH_DIM_R                                      ~8      ~7, 'foo'
          9        SEND_VAL                                                 ~8
         10        DO_ICALL                                                 
   11    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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