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<?php class Foo {} class Bar extends Foo {} var_dump((new ReflectionClass('Bar'))->isSubclassOf(new ReflecitonClass('Foo')));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SOIsh
function name:  (null)
number of ops:  13
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                               'var_dump'
          1        NEW                                              $0      'ReflectionClass'
          2        SEND_VAL_EX                                              'Bar'
          3        DO_FCALL                                      0          
          4        INIT_METHOD_CALL                                         $0, 'isSubclassOf'
          5        NEW                                              $2      'ReflecitonClass'
          6        SEND_VAL_EX                                              'Foo'
          7        DO_FCALL                                      0          
          8        SEND_VAR_NO_REF_EX                                       $2
          9        DO_FCALL                                      0  $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Class Foo: [no user functions]
Class Bar: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0


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