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<?php define('NULL','hello world'); $a; if($a==NuLL){ echo 'ok'; }else{ echo 'bad'; } ?>
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 8
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 9
Branch analysis from position: 9
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OutNb
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'define'
          1        SEND_VAL                                                 'NULL'
          2        SEND_VAL                                                 'hello+world'
          3        DO_ICALL                                                 
    4     4        IS_EQUAL                                                 !0, null
          5      > JMPZ                                                     ~2, ->8
    5     6    >   ECHO                                                     'ok'
          7      > JMP                                                      ->9
    7     8    >   ECHO                                                     'bad'
    9     9    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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