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<?php echo '------------ Teste ------------' . PHP_EOL; $variavel = 'teste'; var_dump(isset($variavel), is_null($variavel)); echo '------------ NULL ------------' . PHP_EOL; $variavel = null; var_dump(isset($variavel), is_null($variavel)); echo '------------ Unset ------------' . PHP_EOL; unset($variavel); var_dump(isset($variavel), is_null($variavel));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/4WumW
function name:  (null)
number of ops:  25
compiled vars:  !0 = $variavel
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ECHO                                                     '------------+Teste+------------%0A'
    4     1        ASSIGN                                                   !0, 'teste'
    5     2        INIT_FCALL                                               'var_dump'
          3        ISSET_ISEMPTY_CV                                 ~2      !0
          4        SEND_VAL                                                 ~2
          5        TYPE_CHECK                                    2  ~3      !0
          6        SEND_VAL                                                 ~3
          7        DO_ICALL                                                 
    7     8        ECHO                                                     '------------+NULL+------------%0A'
    8     9        ASSIGN                                                   !0, null
    9    10        INIT_FCALL                                               'var_dump'
         11        ISSET_ISEMPTY_CV                                 ~6      !0
         12        SEND_VAL                                                 ~6
         13        TYPE_CHECK                                    2  ~7      !0
         14        SEND_VAL                                                 ~7
         15        DO_ICALL                                                 
   11    16        ECHO                                                     '------------+Unset+------------%0A'
   12    17        UNSET_CV                                                 !0
   13    18        INIT_FCALL                                               'var_dump'
         19        ISSET_ISEMPTY_CV                                 ~9      !0
         20        SEND_VAL                                                 ~9
         21        TYPE_CHECK                                    2  ~10     !0
         22        SEND_VAL                                                 ~10
         23        DO_ICALL                                                 
         24      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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