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<?php $a = new SplFixedArray(1); $a[0] = 1; $a[0]++; var_dump($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qT43k
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   NEW                                                  $1      'SplFixedArray'
          1        SEND_VAL_EX                                                  1
          2        DO_FCALL                                          0          
          3        ASSIGN                                                       !0, $1
    4     4        ASSIGN_DIM                                                   !0, 0
          5        OP_DATA                                                      1
    5     6        FETCH_DIM_RW                                         $5      !0, 0
          7        PRE_INC                                                      $5
    7     8        INIT_FCALL                                                   'var_dump'
          9        SEND_VAR                                                     !0
         10        DO_ICALL                                                     
         11      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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