This option determines if the watcher will keep the run() loop
from returning. By default all watchers set "keep_alive" => true.
Setting this value to false is ideal for registering non-crucial
watchers (e.g. cache invalidation timers) that should run for the
life of the program but shouldn't prevent the event loop from
returning if all essential tasks have completed.
<?php
echo "before run\n";
run(function () {
immediately(function () {
echo "immediately\n";
});
once(function () {
echo "once\n";
}, 100, ["keep_alive" => false]);
repeat(function () {
echo "repeat\n";
}, 500, ["keep_alive" => false]);
echo "onStart end\n";
});
echo "after run\n";
The above snippet will have the following output:
before run
immediately
after run
The Amp\info() function now also reports the number of
keep_alive watchers currently registered via the "keep_alive" key.
- Added `Amp\coroutine()` function
- `YieldCommands` "enum" constant class removed -- yield keys now live in
the reactor class
- New optional `"coroutine"` yield key for self-documenting generator
yields.
- New optional `"async"` yield key for self-documenting promise yields.
- New `"return"` yield key for specifying the return value of a resolved
Generator coroutine. If not specified a resolved coroutine result is
equal to null.
- The final value yielded by a resolved `Generator` is *no longer* used
as its "return" value. Instead, generators must manually use the new
`"return"` yield key specifically to designate the value that should
be used to resolve the promise associated with generator resolution.
- `GeneratorResolver` trait renamed to `CoroutineResolver` and is now an
abstract class extended by the various `Reactor` implementations.
- Implicit "all" array combinator resolution is now removed. Use the
explicit form instead:
```php
function() {
list($a, $b, $c) = (yield 'all' => [$promise1, $promise2, $promise3]);
};
```
