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<?php if (isset($i1)){ print "\$i1 is assigned a value"; } else { print "\$i1 does not exist or has no value assigned to"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 2, Position 2 = 4
Branch analysis from position: 2
1 jumps found. (Code = 42) Position 1 = 5
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UgNnY
function name:  (null)
number of ops:  6
compiled vars:  !0 = $i1
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ISSET_ISEMPTY_CV                                         !0
          1      > JMPZ                                                     ~1, ->4
    3     2    >   ECHO                                                     '%24i1+is+assigned+a+value'
          3      > JMP                                                      ->5
    6     4    >   ECHO                                                     '%24i1+does+not+exist+or+has+no+value+assigned+to'
    7     5    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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