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<?php function a(&$a = 19) { $a .= 1; } $b = 6; a($b); echo $b++;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kNMVR
function name:  (null)
number of ops:  7
compiled vars:  !0 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   ASSIGN                                                   !0, 6
    7     1        INIT_FCALL                                               'a'
          2        SEND_REF                                                 !0
          3        DO_FCALL                                      0          
    8     4        POST_INC                                         ~3      !0
          5        ECHO                                                     ~3
          6      > RETURN                                                   1

Function a:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kNMVR
function name:  a
number of ops:  3
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV_INIT                                        !0      19
    4     1        ASSIGN_OP                                     8          !0, 1
    5     2      > RETURN                                                   null

End of function a

Generated using Vulcan Logic Dumper, using php 8.0.0


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