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<?php function f(&$x) {$x = 1;} f(@$x); echo $x;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PmTnN
function name:  (null)
number of ops:  8
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'f'
          1        BEGIN_SILENCE                                    ~1      
          2        FETCH_R                      local               ~2      'x'
          3        END_SILENCE                                              ~1
          4        SEND_VAL_EX                                              ~2
          5        DO_FCALL                                      0          
    4     6        ECHO                                                     !0
          7      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PmTnN
function name:  f
number of ops:  3
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
          1        ASSIGN                                                   !0, 1
          2      > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 8.0.0


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