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<?php var_dump(is_null());var_dump(is_null(null));var_dump(is_null(null, null));var_dump(is_null(null, null, null));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PLn7o
function name:  (null)
number of ops:  25
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'is_null'
          2        DO_ICALL                                         $0      
          3        SEND_VAR                                                 $0
          4        DO_ICALL                                                 
          5        INIT_FCALL                                               'var_dump'
          6        TYPE_CHECK                                    2  ~2      null
          7        SEND_VAL                                                 ~2
          8        DO_ICALL                                                 
          9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'is_null'
         11        SEND_VAL                                                 null
         12        SEND_VAL                                                 null
         13        DO_ICALL                                         $4      
         14        SEND_VAR                                                 $4
         15        DO_ICALL                                                 
         16        INIT_FCALL                                               'var_dump'
         17        INIT_FCALL                                               'is_null'
         18        SEND_VAL                                                 null
         19        SEND_VAL                                                 null
         20        SEND_VAL                                                 null
         21        DO_ICALL                                         $6      
         22        SEND_VAR                                                 $6
         23        DO_ICALL                                                 
         24      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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