3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { } class Bar extends Foo {} class Baz extends Bar {} class Service { public function supports($object) { return is_subclass_of($object, Foo::class); } } $s = new Service(); var_dump($s->supports(new Bar()));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/H2jHR
function name:  (null)
number of ops:  12
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E >   NEW                                              $1      'Service'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
   17     3        INIT_FCALL                                               'var_dump'
          4        INIT_METHOD_CALL                                         !0, 'supports'
          5        NEW                                              $4      'Bar'
          6        DO_FCALL                                      0          
          7        SEND_VAR_NO_REF_EX                                       $4
          8        DO_FCALL                                      0  $6      
          9        SEND_VAR                                                 $6
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Class Foo: [no user functions]
Class Bar: [no user functions]
Class Baz: [no user functions]
Class Service:
Function supports:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/H2jHR
function name:  supports
number of ops:  7
compiled vars:  !0 = $object
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   RECV                                             !0      
   11     1        INIT_FCALL                                               'is_subclass_of'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'Foo'
          4        DO_ICALL                                         $1      
          5      > RETURN                                                   $1
   12     6*     > RETURN                                                   null

End of function supports

End of class Service.

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
147.86 ms | 1395 KiB | 17 Q