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<?php $s = 'string'; $a = []; $a['foo'] =& $s; var_dump($a); $a = []; $a['foo'] = $s; var_dump($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iaqnA
function name:  (null)
number of ops:  14
compiled vars:  !0 = $s, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'string'
    4     1        ASSIGN                                                   !1, <array>
    5     2        FETCH_DIM_W                                      $4      !1, 'foo'
          3        ASSIGN_REF                                               $4, !0
    6     4        INIT_FCALL                                               'var_dump'
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                                 
    8     7        ASSIGN                                                   !1, <array>
    9     8        ASSIGN_DIM                                               !1, 'foo'
          9        OP_DATA                                                  !0
   10    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !1
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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