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<?php $b = null; var_dump(isset($a)); var_dump(isset($b)); var_dump($a==null); var_dump($b==null); var_dump($a===null); var_dump($b===null);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/EN7YD
function name:  (null)
number of ops:  26
compiled vars:  !0 = $b, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    5     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_CV                                 ~3      !1
          3        SEND_VAL                                                 ~3
          4        DO_ICALL                                                 
    6     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_CV                                 ~5      !0
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
    8     9        INIT_FCALL                                               'var_dump'
         10        IS_EQUAL                                         ~7      !1, null
         11        SEND_VAL                                                 ~7
         12        DO_ICALL                                                 
    9    13        INIT_FCALL                                               'var_dump'
         14        IS_EQUAL                                         ~9      !0, null
         15        SEND_VAL                                                 ~9
         16        DO_ICALL                                                 
   11    17        INIT_FCALL                                               'var_dump'
         18        TYPE_CHECK                                    2  ~11     !1
         19        SEND_VAL                                                 ~11
         20        DO_ICALL                                                 
   12    21        INIT_FCALL                                               'var_dump'
         22        TYPE_CHECK                                    2  ~13     !0
         23        SEND_VAL                                                 ~13
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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