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<?php function x($x=null){ var_dump(func_num_args(), func_get_args()); } x(); x(null); x(1);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/R0iG8
function name:  (null)
number of ops:  9
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   INIT_FCALL                                               'x'
          1        DO_FCALL                                      0          
    5     2        INIT_FCALL                                               'x'
          3        SEND_VAL                                                 null
          4        DO_FCALL                                      0          
    6     5        INIT_FCALL                                               'x'
          6        SEND_VAL                                                 1
          7        DO_FCALL                                      0          
          8      > RETURN                                                   1

Function x:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/R0iG8
function name:  x
number of ops:  8
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV_INIT                                        !0      null
          1        INIT_FCALL                                               'var_dump'
          2        FUNC_NUM_ARGS                                    ~1      
          3        SEND_VAL                                                 ~1
          4        FUNC_GET_ARGS                                    ~2      
          5        SEND_VAL                                                 ~2
          6        DO_ICALL                                                 
          7      > RETURN                                                   null

End of function x

Generated using Vulcan Logic Dumper, using php 8.0.0


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