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Bugs & Features
<?php function iterator() { for ($i = 1; $i <= 10; $i++) { echo 'pre it' . $i . PHP_EOL;die; $res = yield $i; //var_dump($res); } } $generator = iterator(); foreach ($generator as $val){ echo $val . PHP_EOL; $generator->send('hi'); }
based on cUYp3
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/9Yj0b
function name:  (null)
number of ops:  14
compiled vars:  !0 = $generator, !1 = $val
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   NOP                                                      
  13     1        INIT_FCALL                                               'iterator'
         2        DO_FCALL                                      0  $2      
         3        ASSIGN                                                   !0, $2
  14     4      > FE_RESET_R                                       $4      !0, ->12
         5    > > FE_FETCH_R                                               $4, !1, ->12
  15     6    >   CONCAT                                           ~5      !1, '%0A'
         7        ECHO                                                     ~5
  16     8        INIT_METHOD_CALL                                         !0, 'send'
         9        SEND_VAL_EX                                              'hi'
        10        DO_FCALL                                      0          
        11      > JMP                                                      ->5
        12    >   FE_FREE                                                  $4
  17    13      > RETURN                                                   1

Function iterator:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 11
Branch analysis from position: 11
2 jumps found. (Code = 44) Position 1 = 13, Position 2 = 3
Branch analysis from position: 13
1 jumps found. (Code = 161) Position 1 = -2
Branch analysis from position: 3
1 jumps found. (Code = 79) Position 1 = -2
filename:       /in/9Yj0b
function name:  iterator
number of ops:  14
compiled vars:  !0 = $i, !1 = $res
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   GENERATOR_CREATE                                         
   5     1        ASSIGN                                                   !0, 1
         2      > JMP                                                      ->11
   7     3    >   CONCAT                                           ~3      'pre+it', !0
         4        CONCAT                                           ~4      ~3, '%0A'
         5        ECHO                                                     ~4
         6      > EXIT                                                     
   8     7*       YIELD                                            $5      !0
         8*       ASSIGN                                                   !1, $5
   5     9*       POST_INC                                         ~7      !0
        10*       FREE                                                     ~7
        11    >   IS_SMALLER_OR_EQUAL                              ~8      !0, 10
        12      > JMPNZ                                                    ~8, ->3
  11    13    > > GENERATOR_RETURN                                         

End of function iterator

Generated using Vulcan Logic Dumper, using php 7.3.0