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<?php $a = 1; unset($a); var_dump(isset($a)); var_dump(!isset($a)); var_dump(empty($a)); var_dump(is_null($a));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RtIm9
function name:  (null)
number of ops:  20
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 1
    5     1        UNSET_CV                                                 !0
    8     2        INIT_FCALL                                               'var_dump'
          3        ISSET_ISEMPTY_CV                                 ~2      !0
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
    9     6        INIT_FCALL                                               'var_dump'
          7        ISSET_ISEMPTY_CV                                 ~4      !0
          8        BOOL_NOT                                         ~5      ~4
          9        SEND_VAL                                                 ~5
         10        DO_ICALL                                                 
   10    11        INIT_FCALL                                               'var_dump'
         12        ISSET_ISEMPTY_CV                                 ~7      !0
         13        SEND_VAL                                                 ~7
         14        DO_ICALL                                                 
   11    15        INIT_FCALL                                               'var_dump'
         16        TYPE_CHECK                                    2  ~9      !0
         17        SEND_VAL                                                 ~9
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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