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<?php error_reporting(E_ALL); echo $_GET['aaa']; $user = $_GET['xxx'] ?? 'nobody'; var_dump($user); $null = ''; var_dump($null??'haha'); $arr = ['a' => 1]; echo $arr[0]; var_dump($arr['b'] ?? 'bbbb');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lSEef
function name:  (null)
number of ops:  30
compiled vars:  !0 = $user, !1 = $null, !2 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'error_reporting'
          1        SEND_VAL                                                 32767
          2        DO_ICALL                                                 
    3     3        FETCH_R                      global              ~4      '_GET'
          4        FETCH_DIM_R                                      ~5      ~4, 'aaa'
          5        ECHO                                                     ~5
    4     6        FETCH_IS                                         ~6      '_GET'
          7        FETCH_DIM_IS                                     ~7      ~6, 'xxx'
          8        COALESCE                                         ~8      ~7
          9        QM_ASSIGN                                        ~8      'nobody'
         10        ASSIGN                                                   !0, ~8
    5    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                                 
    6    14        ASSIGN                                                   !1, ''
    7    15        INIT_FCALL                                               'var_dump'
         16        COALESCE                                         ~12     !1
         17        QM_ASSIGN                                        ~12     'haha'
         18        SEND_VAL                                                 ~12
         19        DO_ICALL                                                 
    8    20        ASSIGN                                                   !2, <array>
    9    21        FETCH_DIM_R                                      ~15     !2, 0
         22        ECHO                                                     ~15
   10    23        INIT_FCALL                                               'var_dump'
         24        FETCH_DIM_IS                                     ~16     !2, 'b'
         25        COALESCE                                         ~17     ~16
         26        QM_ASSIGN                                        ~17     'bbbb'
         27        SEND_VAL                                                 ~17
         28        DO_ICALL                                                 
         29      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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