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<?php declare(strict_types=1); interface Response {} interface Request {} class RespImpl implements Response {} class ReqImpl implements Request {} interface Psr { public function sendRequest(Request $request): Response; } interface Httplug { public function sendRequest(Request $request); } //interface PsrBridge extends Psr, Httplug {} // does work interface PsrBridge extends Httplug, Psr {} // does not work class HttpClient implements PsrBridge { public function sendRequest(Request $request): Response { return new RespImpl(); } } $client = new HttpClient(); $response = $client->sendRequest(new ReqImpl()); echo $response instanceof Response ? 'OK' : 'Fail!';
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 15, Position 2 = 17
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 18
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MMCL3
function name:  (null)
number of ops:  20
compiled vars:  !0 = $client, !1 = $response
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   DECLARE_CLASS                                            'respimpl'
   11     1        DECLARE_CLASS                                            'reqimpl'
   22     2        DECLARE_CLASS                                            'psrbridge'
   24     3        DECLARE_CLASS                                            'httpclient'
   30     4        NEW                                              $2      'HttpClient'
          5        DO_FCALL                                      0          
          6        ASSIGN                                                   !0, $2
   31     7        INIT_METHOD_CALL                                         !0, 'sendRequest'
          8        NEW                                              $5      'ReqImpl'
          9        DO_FCALL                                      0          
         10        SEND_VAR_NO_REF_EX                                       $5
         11        DO_FCALL                                      0  $7      
         12        ASSIGN                                                   !1, $7
   32    13        INSTANCEOF                                               !1, 'Response'
         14      > JMPZ                                                     ~9, ->17
         15    >   QM_ASSIGN                                        ~10     'OK'
         16      > JMP                                                      ->18
         17    >   QM_ASSIGN                                        ~10     'Fail%21'
         18    >   ECHO                                                     ~10
         19      > RETURN                                                   1

Class Response: [no user functions]
Class Request: [no user functions]
Class RespImpl: [no user functions]
Class ReqImpl: [no user functions]
Class Psr:
Function sendrequest:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MMCL3
function name:  sendRequest
number of ops:  3
compiled vars:  !0 = $request
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   RECV                                             !0      
          1        VERIFY_RETURN_TYPE                                       
          2      > RETURN                                                   null

End of function sendrequest

End of class Psr.

Class Httplug:
Function sendrequest:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MMCL3
function name:  sendRequest
number of ops:  2
compiled vars:  !0 = $request
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   18     0  E >   RECV                                             !0      
          1      > RETURN                                                   null

End of function sendrequest

End of class Httplug.

Class PsrBridge: [no user functions]
Class HttpClient:
Function sendrequest:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MMCL3
function name:  sendRequest
number of ops:  7
compiled vars:  !0 = $request
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   25     0  E >   RECV                                             !0      
   26     1        NEW                                              $1      'RespImpl'
          2        DO_FCALL                                      0          
          3        VERIFY_RETURN_TYPE                                       $1
          4      > RETURN                                                   $1
   27     5*       VERIFY_RETURN_TYPE                                       
          6*     > RETURN                                                   null

End of function sendrequest

End of class HttpClient.

Generated using Vulcan Logic Dumper, using php 8.0.0


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