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Can it be that the worker starts processing the response from call 1 as soon as it arrives with the condition that it is after the call 3 was initiated while the worker waits? In current implementation or new feature implementation of PHP I mean. Something like this:

This would be the current doable situation via the above:

For single threaded request/command situation the only situation where a time improvement could be possible is when a call is made to outside with some info (not with the whole scope) and a waiting time is needed. So maybe going on that path could be an alternative (curl_multi_init, mysqli_poll, starting parallel new processes like laravel does with their concurrency etc).

For single threaded request/command situation the only situation where a time improvement could be possible is when a call is made to outside with some info (not with the whole scope) and a waiting time is needed. So maybe going on that path could be a BETTER alternative to async (curl_multi_init, mysqli_poll, starting parallel new processes like laravel does with their concurrency, amphp/mysql package that already uses php fibers etc).