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<?php $a = []; $b = [&$a]; $a[0] = &$b; var_dump($a === $b);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/d0jjM
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    4     1        INIT_ARRAY                                           ~3      !0
          2        ASSIGN                                                       !1, ~3
    5     3        FETCH_DIM_W                                          $5      !0, 0
          4        ASSIGN_REF                                                   $5, !1
    7     5        INIT_FCALL                                                   'var_dump'
          6        IS_IDENTICAL                                         ~7      !0, !1
          7        SEND_VAL                                                     ~7
          8        DO_ICALL                                                     
          9      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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