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<?php function gen(): Generator { yield fn($a) => 'b' => 'c'; } gen(); foreach(gen() as $key => $value) { var_dump($key, $value); }
based on sbeOf
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/pLle7
function name:  (null)
number of ops:  14
compiled vars:  !0 = $value, !1 = $key
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   INIT_FCALL                                               'gen'
         1        DO_FCALL                                      0          
  10     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
  11     7        INIT_FCALL                                               'var_dump'
         8        SEND_VAR                                                 !1
         9        SEND_VAR                                                 !0
        10        DO_ICALL                                                 
  10    11      > JMP                                                      ->5
        12    >   FE_FREE                                                  $4
  12    13      > RETURN                                                   1

Function gen:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 161) Position 1 = -2
filename:       /in/pLle7
function name:  gen
number of ops:  4
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   DECLARE_CLASS                                            
   5     1        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FpLle70x7f4c32878274'
         2        YIELD                                                    'c', ~0
   6     3      > GENERATOR_RETURN                                         

End of function gen

Function %00%7Bclosure%7D%2Fin%2FpLle70x7f4c32878274:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/pLle7
function name:  {closure}
number of ops:  3
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   5     0  E >   RECV                                             !0      
         1      > RETURN                                                   'b'
         2*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FpLle70x7f4c32878274

Generated using Vulcan Logic Dumper, using php 7.4.0