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<?php function test(&$arr = array()) { var_dump($arr); } test($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iOQiH
function name:  (null)
number of ops:  4
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                               'test'
          1        SEND_REF                                                 !0
          2        DO_FCALL                                      0          
          3      > RETURN                                                   1

Function test:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iOQiH
function name:  test
number of ops:  5
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV_INIT                                        !0      <array>
    3     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    4     4      > RETURN                                                   null

End of function test

Generated using Vulcan Logic Dumper, using php 8.0.0


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