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<?php class A {} class B extends A {} class C { function foo (B $a){} } class D extends C { function foo (A $a){} }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gUJNo
function name:  (null)
number of ops:  1
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E > > RETURN                                                   1

Class A: [no user functions]
Class B: [no user functions]
Class C:
Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gUJNo
function name:  foo
number of ops:  2
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   RECV                                             !0      
          1      > RETURN                                                   null

End of function foo

End of class C.

Class D:
Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/gUJNo
function name:  foo
number of ops:  2
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   RECV                                             !0      
          1      > RETURN                                                   null

End of function foo

End of class D.

Generated using Vulcan Logic Dumper, using php 8.0.0


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