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<?php $a = []; $b = ["item_data"=>[a,b,c]]; $b = ["item_data"=>[d,e,f]]; $c = array_merge($a,$b,$c); var_dump($c);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PENJd
function name:  (null)
number of ops:  27
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        FETCH_CONSTANT                                   ~4      'a'
          2        INIT_ARRAY                                       ~5      ~4
          3        FETCH_CONSTANT                                   ~6      'b'
          4        ADD_ARRAY_ELEMENT                                ~5      ~6
          5        FETCH_CONSTANT                                   ~7      'c'
          6        ADD_ARRAY_ELEMENT                                ~5      ~7
          7        INIT_ARRAY                                       ~8      ~5, 'item_data'
          8        ASSIGN                                                   !1, ~8
    4     9        FETCH_CONSTANT                                   ~10     'd'
         10        INIT_ARRAY                                       ~11     ~10
         11        FETCH_CONSTANT                                   ~12     'e'
         12        ADD_ARRAY_ELEMENT                                ~11     ~12
         13        FETCH_CONSTANT                                   ~13     'f'
         14        ADD_ARRAY_ELEMENT                                ~11     ~13
         15        INIT_ARRAY                                       ~14     ~11, 'item_data'
         16        ASSIGN                                                   !1, ~14
    5    17        INIT_FCALL                                               'array_merge'
         18        SEND_VAR                                                 !0
         19        SEND_VAR                                                 !1
         20        SEND_VAR                                                 !2
         21        DO_ICALL                                         $16     
         22        ASSIGN                                                   !2, $16
    6    23        INIT_FCALL                                               'var_dump'
         24        SEND_VAR                                                 !2
         25        DO_ICALL                                                 
         26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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