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<?php function f($a,$b,$c){ var_dump(get_defined_vars()); } f();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Yp66d
function name:  (null)
number of ops:  3
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   INIT_FCALL                                               'f'
          1        DO_FCALL                                      0          
          2      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Yp66d
function name:  f
number of ops:  9
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        RECV                                             !2      
    4     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'get_defined_vars'
          5        DO_ICALL                                         $3      
          6        SEND_VAR                                                 $3
          7        DO_ICALL                                                 
    5     8      > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 8.0.0


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