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<?php class Foo{ function method($a){ } } class Bar extends Foo{ function method(array $a){ } }
based on c0C7p
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/fSIbS
function name:  (null)
number of ops:  4
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   NOP                                                      
   7     1        NOP                                                      
         2        NOP                                                      
  11     3      > RETURN                                                   1

Class Foo:
Function method:
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/fSIbS
function name:  method
number of ops:  2
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
   5     1      > RETURN                                                   null

End of function method

End of class Foo.

Class Bar:
Function method:
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/fSIbS
function name:  method
number of ops:  2
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   RECV                                             !0      
  10     1      > RETURN                                                   null

End of function method

End of class Bar.

Generated using Vulcan Logic Dumper, using php 7.1.0