It is impossible to use `parent::` on a method using a Generator.

[SenseiTarzan]

Description

The following code:

<?php
class foo {
    public function test(): Generator {
        yield "hello";
    }
}

class bar extends foo {

    public function __construct(
        private array $exemple = [])
    {
    }

    public function test(): Generator {
        if (empty($this->exemple)) {
            parent::test();
        }else
        {
            yield $this->exemple;
        }
    }
}
# 1
$test = new foo();
foreach ($test->test() as $value) {
    var_dump($value);
}
//---------------------------------------------------------------

# 2
$bar = new bar();
foreach ($bar->test() as $value) {
    var_dump($value);
}
//---------------------------------------------------------------
# 3
$bar = new bar([
    "hello" => "world",
]);

foreach ($bar->test() as $value) {
    var_dump($value);
}

Resulted in this output:

# 1
## Result:
### string(5) "hello"

# 2
## Result:
### string(5) "hello"

# 3
## Result:
### array(1) {
###    ["hello"]=>
###  string(5) "world"
### }

But I expected this output instead:

# 2
## Result:
### No existent but normally i should have string(5) "hello"

The only way to execute the parent is to use yield from parent::{method}(). I'm not sure if this was intended, but it seems logical, albeit strange, because we expect parent:: to return the yield 'hello', but it doesn't and must be executed in a different manner.

PHP Version

PHP 8.2.27

Operating System

Ubuntu 22.04LTS and Windows 11

[iluuu1994]

You need to actually yield from the parent generator. https://3v4l.org/i3uHn

[iluuu1994]

I missed you already mentioned that. Yes, you need the yield from. There are two generators involved here, and you need to merge the results of the two.