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<?php $a[1][2][3] = TRUE; var_dump(isset($a[1][2][3]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U0qlE
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   FETCH_DIM_W                                      $1      !0, 1
          1        FETCH_DIM_W                                      $2      $1, 2
          2        ASSIGN_DIM                                               $2, 3
          3        OP_DATA                                                  <true>
    5     4        INIT_FCALL                                               'var_dump'
          5        FETCH_DIM_IS                                     ~4      !0, 1
          6        FETCH_DIM_IS                                     ~5      ~4, 2
          7        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      ~5, 3
          8        SEND_VAL                                                 ~6
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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