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<?php $a = '0'; $b = 'NULL'; var_dump($a == $b); var_dump(is_null($a)); var_dump(is_null($b)); var_dump(empty($a)); var_dump(empty($b)); var_dump($a == '0'); var_dump($b == '0');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5FJUc
function name:  (null)
number of ops:  31
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '0'
    3     1        ASSIGN                                                   !1, 'NULL'
    5     2        INIT_FCALL                                               'var_dump'
          3        IS_EQUAL                                         ~4      !0, !1
          4        SEND_VAL                                                 ~4
          5        DO_ICALL                                                 
    6     6        INIT_FCALL                                               'var_dump'
          7        TYPE_CHECK                                    2  ~6      !0
          8        SEND_VAL                                                 ~6
          9        DO_ICALL                                                 
    7    10        INIT_FCALL                                               'var_dump'
         11        TYPE_CHECK                                    2  ~8      !1
         12        SEND_VAL                                                 ~8
         13        DO_ICALL                                                 
    8    14        INIT_FCALL                                               'var_dump'
         15        ISSET_ISEMPTY_CV                                 ~10     !0
         16        SEND_VAL                                                 ~10
         17        DO_ICALL                                                 
    9    18        INIT_FCALL                                               'var_dump'
         19        ISSET_ISEMPTY_CV                                 ~12     !1
         20        SEND_VAL                                                 ~12
         21        DO_ICALL                                                 
   10    22        INIT_FCALL                                               'var_dump'
         23        IS_EQUAL                                         ~14     !0, '0'
         24        SEND_VAL                                                 ~14
         25        DO_ICALL                                                 
   11    26        INIT_FCALL                                               'var_dump'
         27        IS_EQUAL                                         ~16     !1, '0'
         28        SEND_VAL                                                 ~16
         29        DO_ICALL                                                 
         30      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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