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<?php var_dump( $a[0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0] ?? $b ?? 'c' );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/9emPr
function name:  (null)
number of ops:  37
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
    4     1        FETCH_DIM_IS                                     ~2      !0, 0
          2        FETCH_DIM_IS                                     ~3      ~2, 0
          3        FETCH_DIM_IS                                     ~4      ~3, 0
          4        FETCH_DIM_IS                                     ~5      ~4, 0
          5        FETCH_DIM_IS                                     ~6      ~5, 0
          6        FETCH_DIM_IS                                     ~7      ~6, 0
          7        FETCH_DIM_IS                                     ~8      ~7, 0
          8        FETCH_DIM_IS                                     ~9      ~8, 0
          9        FETCH_DIM_IS                                     ~10     ~9, 0
         10        FETCH_DIM_IS                                     ~11     ~10, 0
         11        FETCH_DIM_IS                                     ~12     ~11, 0
         12        FETCH_DIM_IS                                     ~13     ~12, 0
         13        FETCH_DIM_IS                                     ~14     ~13, 0
         14        FETCH_DIM_IS                                     ~15     ~14, 0
         15        FETCH_DIM_IS                                     ~16     ~15, 0
         16        FETCH_DIM_IS                                     ~17     ~16, 0
         17        FETCH_DIM_IS                                     ~18     ~17, 0
         18        FETCH_DIM_IS                                     ~19     ~18, 0
         19        FETCH_DIM_IS                                     ~20     ~19, 0
         20        FETCH_DIM_IS                                     ~21     ~20, 0
         21        FETCH_DIM_IS                                     ~22     ~21, 0
         22        FETCH_DIM_IS                                     ~23     ~22, 0
         23        FETCH_DIM_IS                                     ~24     ~23, 0
         24        FETCH_DIM_IS                                     ~25     ~24, 0
         25        FETCH_DIM_IS                                     ~26     ~25, 0
         26        FETCH_DIM_IS                                     ~27     ~26, 0
         27        FETCH_DIM_IS                                     ~28     ~27, 0
         28        FETCH_DIM_IS                                     ~29     ~28, 0
         29        FETCH_DIM_IS                                     ~30     ~29, 0
         30        COALESCE                                         ~31     ~30
         31        COALESCE                                         ~32     !1
         32        QM_ASSIGN                                        ~32     'c'
         33        QM_ASSIGN                                        ~31     ~32
         34        SEND_VAL                                                 ~31
         35        DO_ICALL                                                 
    5    36      > RETURN                                                   1

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