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<?php function test(int $x = null) { var_export($x); } test(1); test(null); test('x');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5SGUh
function name:  (null)
number of ops:  10
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                               'test'
          1        SEND_VAL                                                 1
          2        DO_FCALL                                      0          
    6     3        INIT_FCALL                                               'test'
          4        SEND_VAL                                                 null
          5        DO_FCALL                                      0          
    7     6        INIT_FCALL                                               'test'
          7        SEND_VAL                                                 'x'
          8        DO_FCALL                                      0          
          9      > RETURN                                                   1

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

End of function test

Generated using Vulcan Logic Dumper, using php 8.0.0


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