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<?php error_reporting(-1); class A { public function q(A $a = null) {} } class B { public function q(B $b, A $a) {} } $b = new B(); echo php_error_get_last();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/B21sA
function name:  (null)
number of ops:  10
compiled vars:  !0 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'error_reporting'
          1        SEND_VAL                                                 -1
          2        DO_ICALL                                                 
   13     3        NEW                                              $2      'B'
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !0, $2
   15     6        INIT_FCALL_BY_NAME                                       'php_error_get_last'
          7        DO_FCALL                                      0  $5      
          8        ECHO                                                     $5
          9      > RETURN                                                   1

Class A:
Function q:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/B21sA
function name:  q
number of ops:  2
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   RECV_INIT                                        !0      null
          1      > RETURN                                                   null

End of function q

End of class A.

Class B:
Function q:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/B21sA
function name:  q
number of ops:  3
compiled vars:  !0 = $b, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2      > RETURN                                                   null

End of function q

End of class B.

Generated using Vulcan Logic Dumper, using php 8.0.0


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