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<?php $true = true; $false = false; var_dump(isset($true)) . PHP_EOL; var_dump(isset($thing)) . PHP_EOL; var_dump(isset($false)) . PHP_EOL;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UPus5
function name:  (null)
number of ops:  21
compiled vars:  !0 = $true, !1 = $false, !2 = $thing
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <true>
    4     1        ASSIGN                                                   !1, <false>
    6     2        INIT_FCALL                                               'var_dump'
          3        ISSET_ISEMPTY_CV                                 ~5      !0
          4        SEND_VAL                                                 ~5
          5        DO_ICALL                                         $6      
          6        CONCAT                                           ~7      $6, '%0A'
          7        FREE                                                     ~7
    7     8        INIT_FCALL                                               'var_dump'
          9        ISSET_ISEMPTY_CV                                 ~8      !2
         10        SEND_VAL                                                 ~8
         11        DO_ICALL                                         $9      
         12        CONCAT                                           ~10     $9, '%0A'
         13        FREE                                                     ~10
    8    14        INIT_FCALL                                               'var_dump'
         15        ISSET_ISEMPTY_CV                                 ~11     !1
         16        SEND_VAL                                                 ~11
         17        DO_ICALL                                         $12     
         18        CONCAT                                           ~13     $12, '%0A'
         19        FREE                                                     ~13
         20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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