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<?php var_dump($undef); // NULL; notice var_dump($undef + 100); // 100 var_dump($undef); // NULL; notice
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OoAZi
function name:  (null)
number of ops:  11
compiled vars:  !0 = $undef
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        SEND_VAR                                                 !0
          2        DO_ICALL                                                 
    4     3        INIT_FCALL                                               'var_dump'
          4        ADD                                              ~2      !0, 100
          5        SEND_VAL                                                 ~2
          6        DO_ICALL                                                 
    5     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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