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<?php function gen(): Generator { yield new stdClass() => 'foo'; yield ['a'] => 'foo'; yield gen2() => 'foo'; yield fn($a) => 'b' => 'c'; } function gen2(): Generator { yield 'bar'; } gen(); foreach(gen() as $key => $value) { var_dump($key, $value); }
based on YLt4O
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 5, Position 2 = 12
Branch analysis from position: 5
2 jumps found. (Code = 78) Position 1 = 6, Position 2 = 12
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 5
Branch analysis from position: 5
Branch analysis from position: 12
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 12
filename:       /in/sbeOf
function name:  (null)
number of ops:  14
compiled vars:  !0 = $value, !1 = $key
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  16     0  E >   INIT_FCALL                                               'gen'
         1        DO_FCALL                                      0          
  18     2        INIT_FCALL                                               'gen'
         3        DO_FCALL                                      0  $3      
         4      > FE_RESET_R                                       $4      $3, ->12
         5    > > FE_FETCH_R                                       ~5      $4, !0, ->12
         6    >   ASSIGN                                                   !1, ~5
  19     7        INIT_FCALL                                               'var_dump'
         8        SEND_VAR                                                 !1
         9        SEND_VAR                                                 !0
        10        DO_ICALL                                                 
  18    11      > JMP                                                      ->5
        12    >   FE_FREE                                                  $4
  20    13      > RETURN                                                   1

Function gen:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 161) Position 1 = -2
filename:       /in/sbeOf
function name:  gen
number of ops:  11
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   DECLARE_CLASS                                            
   5     1        NEW                                              $0      :15
         2        DO_FCALL                                      0          
         3        YIELD                                                    'foo', $0
   6     4        YIELD                                                    'foo', <array>
   7     5        INIT_FCALL_BY_NAME                                       'gen2'
         6        DO_FCALL                                      0  $4      
         7        YIELD                                                    'foo', $4
   8     8        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FsbeOf0x7f9f2a85d58c'
         9        YIELD                                                    'c', ~6
   9    10      > GENERATOR_RETURN                                         

End of function gen

Function %00%7Bclosure%7D%2Fin%2FsbeOf0x7f9f2a85d58c:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/sbeOf
function name:  {closure}
number of ops:  3
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   RECV                                             !0      
         1      > RETURN                                                   'b'
         2*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FsbeOf0x7f9f2a85d58c

Function gen2:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 161) Position 1 = -2
filename:       /in/sbeOf
function name:  gen2
number of ops:  3
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  11     0  E >   DECLARE_CLASS                                            
  13     1        YIELD                                                    'bar'
  14     2      > GENERATOR_RETURN                                         

End of function gen2

Generated using Vulcan Logic Dumper, using php 7.4.0