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<?php function foo(&$arg) { var_dump($arg); } $a = 'bar'; $b =& $a; call_user_func_array('foo', [$b]); call_user_func_array('foo', [&$a]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tDBN8
function name:  (null)
number of ops:  13
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   ASSIGN                                                   !0, 'bar'
    8     1        ASSIGN_REF                                               !1, !0
   10     2        INIT_FCALL                                               'foo'
          3        INIT_ARRAY                                       ~4      !1
          4        SEND_ARRAY                                               ~4
          5        CHECK_UNDEF_ARGS                                         
          6        DO_FCALL                                      0          
   12     7        INIT_FCALL                                               'foo'
          8        INIT_ARRAY                                       ~6      !0
          9        SEND_ARRAY                                               ~6
         10        CHECK_UNDEF_ARGS                                         
         11        DO_FCALL                                      0          
         12      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tDBN8
function name:  foo
number of ops:  5
compiled vars:  !0 = $arg
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    5     4      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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