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<?php function foo (&$bar){ $bar = 'changed'; } call_user_func_array('foo', [&$var]); var_dump($var);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/uq6Q1
function name:  (null)
number of ops:  9
compiled vars:  !0 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   INIT_FCALL                                               'foo'
          1        INIT_ARRAY                                       ~1      !0
          2        SEND_ARRAY                                               ~1
          3        CHECK_UNDEF_ARGS                                         
          4        DO_FCALL                                      0          
    8     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/uq6Q1
function name:  foo
number of ops:  3
compiled vars:  !0 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        ASSIGN                                                   !0, 'changed'
    5     2      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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