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<?php class P {} $x = function(P $p = null) { $t = $p ?? 'lol'; var_dump($t); }; $x(new \P);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Khp8s
function name:  (null)
number of ops:  8
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FKhp8s%3A5%240'
          1        ASSIGN                                                   !0, ~1
   10     2        INIT_DYNAMIC_CALL                                        !0
          3        NEW                                              $3      'P'
          4        DO_FCALL                                      0          
          5        SEND_VAR_NO_REF_EX                                       $3
          6        DO_FCALL                                      0          
          7      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FKhp8s%3A5%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Khp8s
function name:  {closure}
number of ops:  8
compiled vars:  !0 = $p, !1 = $t
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV_INIT                                        !0      null
    6     1        COALESCE                                         ~2      !0
          2        QM_ASSIGN                                        ~2      'lol'
          3        ASSIGN                                                   !1, ~2
    7     4        INIT_FCALL                                               'var_dump'
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                                 
    8     7      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FKhp8s%3A5%240

Class P: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0


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