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<?php $myvar = 0; if (empty($myvar)) { echo "It's empty."; } if(!isset($myvar)) { echo "It's not set."; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 4
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 8
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
Branch analysis from position: 4
filename:       /in/osfXH
function name:  (null)
number of ops:  9
compiled vars:  !0 = $myvar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 0
    5     1        ISSET_ISEMPTY_CV                                         !0
          2      > JMPZ                                                     ~2, ->4
    6     3    >   ECHO                                                     'It%27s+empty.'
    9     4    >   ISSET_ISEMPTY_CV                                 ~3      !0
          5        BOOL_NOT                                         ~4      ~3
          6      > JMPZ                                                     ~4, ->8
   10     7    >   ECHO                                                     'It%27s+not+set.'
   11     8    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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