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<?php $a = 1; $a = null; echo isset($a) ? 'true' : 'false'; var_dump($a);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 6
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 7
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/NMTAP
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 1
    3     1        ASSIGN                                                   !0, null
    4     2        ISSET_ISEMPTY_CV                                         !0
          3      > JMPZ                                                     ~3, ->6
          4    >   QM_ASSIGN                                        ~4      'true'
          5      > JMP                                                      ->7
          6    >   QM_ASSIGN                                        ~4      'false'
          7    >   ECHO                                                     ~4
    5     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !0
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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