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<?php $a = 1; $b = 2; var_export(isset($a, $b)); echo "\n"; var_export(isset($b, $c)); echo "\n"; var_export(isset($c, $d));
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 46) Position 1 = 5, Position 2 = 7
Branch analysis from position: 5
2 jumps found. (Code = 46) Position 1 = 13, Position 2 = 15
Branch analysis from position: 13
2 jumps found. (Code = 46) Position 1 = 21, Position 2 = 23
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 23
Branch analysis from position: 15
Branch analysis from position: 7
filename:       /in/ALi3d
function name:  (null)
number of ops:  26
compiled vars:  !0 = $a, !1 = $b, !2 = $c, !3 = $d
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 1
    4     1        ASSIGN                                                   !1, 2
    6     2        INIT_FCALL                                               'var_export'
          3        ISSET_ISEMPTY_CV                                 ~6      !0
          4      > JMPZ_EX                                          ~6      ~6, ->7
          5    >   ISSET_ISEMPTY_CV                                 ~7      !1
          6        BOOL                                             ~6      ~7
          7    >   SEND_VAL                                                 ~6
          8        DO_ICALL                                                 
    7     9        ECHO                                                     '%0A'
    8    10        INIT_FCALL                                               'var_export'
         11        ISSET_ISEMPTY_CV                                 ~9      !1
         12      > JMPZ_EX                                          ~9      ~9, ->15
         13    >   ISSET_ISEMPTY_CV                                 ~10     !2
         14        BOOL                                             ~9      ~10
         15    >   SEND_VAL                                                 ~9
         16        DO_ICALL                                                 
    9    17        ECHO                                                     '%0A'
   10    18        INIT_FCALL                                               'var_export'
         19        ISSET_ISEMPTY_CV                                 ~12     !2
         20      > JMPZ_EX                                          ~12     ~12, ->23
         21    >   ISSET_ISEMPTY_CV                                 ~13     !3
         22        BOOL                                             ~12     ~13
         23    >   SEND_VAL                                                 ~12
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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