> basically in $result = foo(spawn(bar(baz(file_get_contents())))); file_get_contents() receives
> outside context from spawn() to turn into async mode.
> Also foo(), bar(), baz() can be in different namespaces, different classes, so by looking at
> the code calling file_get_contents(), it's not clear if the result is sync or async.
Ok, then let’s look in detail at what is happening.
> foo(spawn(bar(baz(file_get_contents()))))
i.e.
```php
$result = foo(spawn(bar(...), fn () => baz(file_get_contents())));
```
Did I understand the code correctly?
(Assume there was also some parameter there, like a file name.)
1. We call bar in a separate coroutine, which
2. First calls file_get_contents
3. Then passes the result to the function baz()
Is that correct?
> Also foo(), bar(), baz() can be in different namespaces, different classes, so by looking at
> the code calling file_get_contents(), it's not clear if the result is sync or async.
If we are discussing the code above, then it returns a Promise not of
the file-reading result.
This is a completely different logic, and here the programmer clearly
intended to do something else.
What if the function baz replaces every a character with baz? It's ok.
```php
$foo = file_get_contents('foo.txt'); // sync
$result = spawn($foo); // error because $foo is string
```
Here I don’t understand why someone would intentionally write incorrect code.
Code:
```php
$result = foo(file_get_contents('foo.txt'));
// equivalent to
// the code below has no practical purpose
$result = foo(await(spawn(file_get_contents(...), 'foo.txt')));
```
Is that correct?