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<?php function & genRefInner() { $var = 1; yield $var; } function & genRefOuter() { return genRefInner(); } foreach(genRefOuter() as $i) { var_dump($i); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 8
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 8
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
filename:       /in/sFR11
function name:  (null)
number of ops:  10
compiled vars:  !0 = $i
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  12     0  E >   INIT_FCALL                                               'genrefouter'
         1        DO_FCALL                                      0  $1      
         2      > FE_RESET_R                                       $2      $1, ->8
         3    > > FE_FETCH_R                                               $2, !0, ->8
  13     4    >   INIT_FCALL                                               'var_dump'
         5        SEND_VAR                                                 !0
         6        DO_ICALL                                                 
  12     7      > JMP                                                      ->3
         8    >   FE_FREE                                                  $2
  14     9      > RETURN                                                   1

Function genrefinner:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 161) Position 1 = -2
filename:       /in/sFR11
function name:  genRefInner
number of ops:  4
compiled vars:  !0 = $var
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   DECLARE_CLASS                                            
   4     1        QM_ASSIGN                                                !0
   5     2        YIELD                                                    !0
   6     3      > GENERATOR_RETURN                                         

End of function genrefinner

Function genrefouter:
Finding entry points
Branch analysis from position: 0
Return found
filename:       /in/sFR11
function name:  genRefOuter
number of ops:  4
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   9     0  E >   INIT_FCALL                                               'genrefinner'
         1        DO_FCALL                                      0  $0      
         2      > RETURN_BY_REF                                            $0
  10     3*     > RETURN_BY_REF                                            null

End of function genrefouter

Generated using Vulcan Logic Dumper, using php 7.4.0