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<?php $a = null; $b = false; var_dump([isset($a), empty($a)]); var_dump([isset($b), empty($b)]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/55SYK
function name:  (null)
number of ops:  17
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        ASSIGN                                                   !1, <false>
    5     2        INIT_FCALL                                               'var_dump'
          3        ISSET_ISEMPTY_CV                                 ~4      !0
          4        INIT_ARRAY                                       ~5      ~4
          5        ISSET_ISEMPTY_CV                                 ~6      !0
          6        ADD_ARRAY_ELEMENT                                ~5      ~6
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        ISSET_ISEMPTY_CV                                 ~8      !1
         11        INIT_ARRAY                                       ~9      ~8
         12        ISSET_ISEMPTY_CV                                 ~10     !1
         13        ADD_ARRAY_ELEMENT                                ~9      ~10
         14        SEND_VAL                                                 ~9
         15        DO_ICALL                                                 
         16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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