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

Generated using Vulcan Logic Dumper, using php 8.0.0


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