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

Function func:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/7NpFtB
function name:  func
number of ops:  8
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV_INIT                                        !0      null
    4     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    5     4        INIT_FCALL                                               'var_export'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                                 
    6     7      > RETURN                                                   null

End of function func

Generated using Vulcan Logic Dumper, using php 8.0.0


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