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<?php $baz = 'baz'; function foo(&$var) { echo $GLOBALS["baz"]; $var =& $GLOBALS["baz"]; } $bar = 'bar'; foo($bar); var_dump($bar);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/mv40c
function name:  (null)
number of ops:  9
compiled vars:  !0 = $baz, !1 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'baz'
    8     1        ASSIGN                                                   !1, 'bar'
    9     2        INIT_FCALL                                               'foo'
          3        SEND_REF                                                 !1
          4        DO_FCALL                                      0          
   11     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !1
          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/mv40c
function name:  foo
number of ops:  8
compiled vars:  !0 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
    5     1        FETCH_R                      global              ~1      'GLOBALS'
          2        FETCH_DIM_R                                      ~2      ~1, 'baz'
          3        ECHO                                                     ~2
    6     4        FETCH_W                      global              $3      'GLOBALS'
          5        FETCH_DIM_W                                      $4      $3, 'baz'
          6        ASSIGN_REF                                               !0, $4
    7     7      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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