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<?php $a = null; $entity = (object)$a; $entity->a = 'test'; var_dump($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RkJ0s
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a, !1 = $entity
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        CAST                                          8  ~3      !0
          2        ASSIGN                                                   !1, ~3
    5     3        ASSIGN_OBJ                                               !1, 'a'
          4        OP_DATA                                                  'test'
    6     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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