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<?php $var = "Hello, world!"; if (!isset($var)) { print_r("Yay!"); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 7
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 7
filename:       /in/6dBLD
function name:  (null)
number of ops:  8
compiled vars:  !0 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'Hello%2C+world%21'
    3     1        ISSET_ISEMPTY_CV                                 ~2      !0
          2        BOOL_NOT                                         ~3      ~2
          3      > JMPZ                                                     ~3, ->7
    4     4    >   INIT_FCALL                                               'print_r'
          5        SEND_VAL                                                 'Yay%21'
          6        DO_ICALL                                                 
    5     7    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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