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<?php $counts = array(); $item = 2; $counts[$item] ?? $counts[$item] = 2 ?? $counts[$item]++; var_dump($counts); $counts[$item] ?? $counts[$item] = 1 ?? $counts[$item]++; var_dump($counts);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/I711G
function name:  (null)
number of ops:  29
compiled vars:  !0 = $counts, !1 = $item
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN                                                   !1, 2
    5     2        FETCH_DIM_IS                                     ~4      !0, !1
          3        COALESCE                                         ~5      ~4
          4        COALESCE                                         ~7      2
          5        FETCH_DIM_RW                                     $8      !0, !1
          6        POST_INC                                         ~9      $8
          7        QM_ASSIGN                                        ~7      ~9
          8        ASSIGN_DIM                                       ~6      !0, !1
          9        OP_DATA                                                  ~7
         10        QM_ASSIGN                                        ~5      ~6
         11        FREE                                                     ~5
    6    12        INIT_FCALL                                               'var_dump'
         13        SEND_VAR                                                 !0
         14        DO_ICALL                                                 
    7    15        FETCH_DIM_IS                                     ~11     !0, !1
         16        COALESCE                                         ~12     ~11
         17        COALESCE                                         ~14     1
         18        FETCH_DIM_RW                                     $15     !0, !1
         19        POST_INC                                         ~16     $15
         20        QM_ASSIGN                                        ~14     ~16
         21        ASSIGN_DIM                                       ~13     !0, !1
         22        OP_DATA                                                  ~14
         23        QM_ASSIGN                                        ~12     ~13
         24        FREE                                                     ~12
    8    25        INIT_FCALL                                               'var_dump'
         26        SEND_VAR                                                 !0
         27        DO_ICALL                                                 
         28      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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