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<?php $a=$b=$c=false; $b=42; $result = ($a?:($b?:($c?:false))); var_dump($result);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UjrnD
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a, !1 = $b, !2 = $c, !3 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                           ~4      !2, <false>
          1        ASSIGN                                           ~5      !1, ~4
          2        ASSIGN                                                   !0, ~5
    3     3        ASSIGN                                                   !1, 42
    4     4        JMP_SET                                          ~8      !0, ->10
          5        JMP_SET                                          ~9      !1, ->9
          6        JMP_SET                                          ~10     !2, ->8
          7        QM_ASSIGN                                        ~10     <false>
          8        QM_ASSIGN                                        ~9      ~10
          9        QM_ASSIGN                                        ~8      ~9
         10        ASSIGN                                                   !3, ~8
    5    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !3
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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