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<?php function foo(bool $bar = null) { } foo(true); foo(null);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/S6ua3
function name:  (null)
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   INIT_FCALL                                               'foo'
          1        SEND_VAL                                                 <true>
          2        DO_FCALL                                      0          
    8     3        INIT_FCALL                                               'foo'
          4        SEND_VAL                                                 null
          5        DO_FCALL                                      0          
          6      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/S6ua3
function name:  foo
number of ops:  2
compiled vars:  !0 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV_INIT                                        !0      null
    5     1      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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