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<?php $arr = []; $arr[null] = 1; var_dump($arr); $arr = []; $arr[''] = 1; var_dump($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5TTAO
function name:  (null)
number of ops:  13
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN_DIM                                               !0, null
          2        OP_DATA                                                  1
    5     3        INIT_FCALL                                               'var_dump'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                                 
    7     6        ASSIGN                                                   !0, <array>
    8     7        ASSIGN_DIM                                               !0, ''
          8        OP_DATA                                                  1
    9     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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