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<?php $a = [1, 2]; $a[] = &$b; $b = 4; print_r($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U02Cq
function name:  (null)
number of ops:  8
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    5     1        FETCH_DIM_W                                          $3      !0
          2        ASSIGN_REF                                                   $3, !1
    7     3        ASSIGN                                                       !1, 4
    9     4        INIT_FCALL                                                   'print_r'
          5        SEND_VAR                                                     !0
          6        DO_ICALL                                                     
          7      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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