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<?php $zero = NULL; var_dump(isset($zero)); var_dump(empty($zero)); var_dump(is_null($zero));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IvfqR
function name:  (null)
number of ops:  14
compiled vars:  !0 = $zero
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, null
    4     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_CV                                 ~2      !0
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_CV                                 ~4      !0
          7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        TYPE_CHECK                                    2  ~6      !0
         11        SEND_VAL                                                 ~6
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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