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<?php $a = [[1, 2, 3], [4, 5, 6]]; $a[0] = [1, 1, 1]; var_dump($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WPLJ2
function name:  (null)
number of ops:  7
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        ASSIGN_DIM                                               !0, 0
          2        OP_DATA                                                  <array>
    7     3        INIT_FCALL                                               'var_dump'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                                 
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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