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Date: Mon, 24 Nov 2025 13:56:23 +0000
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Subject: Re: [PHP-DEV] [VOTE] True Async RFC 1.6
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")

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On 24/11/2025 12:15, Bart Vanhoutte wrote:
>
>     Will Legacy Les see a side effect when he upgrades to SDK Susie's
>     new async library?
>
>
> For clarity, Susie's code has turned from something sync like:
>
> ```
> function getFoo(): Foo
> {
>   $resultOne = sendHttpRequest('one');
>   $resultTwo = sendHttpRequest('two');
>
>   return new Foo($resultOne, $resultTwo);
> }
> ```
>
> into something async like:
>
> ```
> function getFoo(): Foo
> {
>   $results = await Async\all([
>     spawn sendHttpRequest('one'),
>     spawn sendHttpRequest('two')
>   ]);
>
>   return new Foo($results[0], $results[1]);
> }
>
> ```
>
> Is that correct Rowan?


It could be as simple as that, but it might also have Coroutine / Future 
objects held internally rather than immediately awaited, e.g. she might 
have changed this:

```
function getNextResult(): Result
{
     if ( $this->needNextPage() ) {
         $this->currentPageOfResults = $this->fetchNextPage();
     }
     return array_shift($this->currentPageOfResults);
}
```

To this:

```
function getNextResult(): Result
{
     if ( $this->needNextPage() ) {
         $this->currentPageOfResults = await $this->nextPageFuture;
         $this->nextPageFuture = spawn $this->fetchNextPage();
     }
     return array_shift($this->currentPageOfResults);
}
```


There might also be interleaved code which is passed in from the 
application - i.e. code written by Beginner Bob or Legacy Les. For 
instance, an implementation of the PSR-3 LoggerInterface, which might be 
referenced inside the fetchNextPage() method which is being run 
asynchronously.


[P.S. Reminder: place your reply _below_ an edited quote, not _above_.]


-- 
Rowan Tommins
[IMSoP]

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    <div class="moz-cite-prefix">On 24/11/2025 12:15, Bart Vanhoutte
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAB9bCb0oD0-YMdCreh0JuRK8h=AyfxAAQ_fuPC6CpUuqAkTHVQ@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Will
          Legacy Les see a side effect when he upgrades to SDK Susie's
          new async library?</blockquote>
        <div><br>
        </div>
        <div>For clarity, Susie's code has turned from something sync
          like:</div>
        <div><br>
        </div>
        <div>```</div>
        <div>function getFoo(): Foo<br>
        </div>
        <div>{</div>
        <div>  $resultOne = sendHttpRequest('one');</div>
        <div>  $resultTwo = sendHttpRequest('two');</div>
        <div><br>
        </div>
        <div>  return new Foo($resultOne, $resultTwo);</div>
        <div>}</div>
        <div>```</div>
        <div><br>
        </div>
        <div>into something async like:</div>
        <div><br>
        </div>
        <div>```</div>
        <div>function getFoo(): Foo</div>
        <div>{</div>
        <div>  $results = await Async\all([<br>
              spawn sendHttpRequest('one'),<br>
              spawn sendHttpRequest('two')<br>
            ]);<br>
          <br>
            return new Foo($results[0], $results[1]);</div>
        <div>}</div>
        <div><br>
          ```</div>
        <div> <br>
          Is that correct Rowan?<br>
        </div>
      </div>
    </blockquote>
    <p><br>
    </p>
    <p>It could be as simple as that, but it might also have Coroutine /
      Future objects held internally rather than immediately awaited,
      e.g. she might have changed this:</p>
    <p>```<br>
      function getNextResult(): Result<br>
      {<br>
          if ( $this-&gt;needNextPage() ) {<br>
              $this-&gt;currentPageOfResults =
      $this-&gt;fetchNextPage();<br>
          }<br>
          return array_shift($this-&gt;currentPageOfResults);<br>
      }<br>
      ```</p>
    <p>To this:</p>
    <p>```<br>
      function getNextResult(): Result<br>
      {<br>
          if ( $this-&gt;needNextPage() ) {<br>
              $this-&gt;currentPageOfResults = await
      $this-&gt;nextPageFuture;<br>
              $this-&gt;nextPageFuture = spawn
      $this-&gt;fetchNextPage();<br>
          }<br>
          return array_shift($this-&gt;currentPageOfResults);<br>
      }<br>
      ```</p>
    <p><br>
    </p>
    <p>There might also be interleaved code which is passed in from the
      application - i.e. code written by Beginner Bob or Legacy Les. For
      instance, an implementation of the PSR-3 LoggerInterface, which
      might be referenced inside the fetchNextPage() method which is
      being run asynchronously.</p>
    <p><br>
    </p>
    <p>[P.S. Reminder: place your reply _below_ an edited quote, not
      _above_.]</p>
    <p><br>
    </p>
    <pre class="moz-signature" cols="72">-- 
Rowan Tommins
[IMSoP]</pre>
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