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<?php $obj = new ArrayObject(["a" => 1]); $obj["a"] .= "test"; var_dump($obj["a"]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lV2FT
function name:  (null)
number of ops:  11
compiled vars:  !0 = $obj
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   NEW                                                  $1      'ArrayObject'
          1        SEND_VAL_EX                                                  <array>
          2        DO_FCALL                                          0          
          3        ASSIGN                                                       !0, $1
    4     4        ASSIGN_DIM_OP                    .=               8          !0, 'a'
          5        OP_DATA                                                      'test'
    5     6        INIT_FCALL                                                   'var_dump'
          7        FETCH_DIM_R                                          ~5      !0, 'a'
          8        SEND_VAL                                                     ~5
          9        DO_ICALL                                                     
         10      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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