$currentPromise
$currentPromise : \GuzzleHttp\Promise\PromiseInterface|null
Creates a promise that is resolved using a generator that yields values or promises (somewhat similar to C#'s async keyword).
When called, the Coroutine::of method will start an instance of the generator and returns a promise that is fulfilled with its final yielded value.
Control is returned back to the generator when the yielded promise settles. This can lead to less verbose code when doing lots of sequential async calls with minimal processing in between.
use GuzzleHttp\Promise;
function createPromise($value) {
return new Promise\FulfilledPromise($value);
}
$promise = Promise\Coroutine::of(function () {
$value = (yield createPromise('a'));
try {
$value = (yield createPromise($value . 'b'));
} catch (\Exception $e) {
// The promise was rejected.
}
yield $value . 'c';
});
// Outputs "abc"
$promise->then(function ($v) { echo $v; });
$currentPromise : \GuzzleHttp\Promise\PromiseInterface|null
$result : \GuzzleHttp\Promise\Promise
then(callable $onFulfilled = null, callable $onRejected = null) : \GuzzleHttp\Promise\PromiseInterface
Appends fulfillment and rejection handlers to the promise, and returns a new promise resolving to the return value of the called handler.
| callable | $onFulfilled | Invoked when the promise fulfills. |
| callable | $onRejected | Invoked when the promise is rejected. |
otherwise(callable $onRejected) : \GuzzleHttp\Promise\PromiseInterface
Appends a rejection handler callback to the promise, and returns a new promise resolving to the return value of the callback if it is called, or to its original fulfillment value if the promise is instead fulfilled.
| callable | $onRejected | Invoked when the promise is rejected. |
wait(mixed $unwrap = true) : mixed
Waits until the promise completes if possible.
Pass $unwrap as true to unwrap the result of the promise, either returning the resolved value or throwing the rejected exception.
If the promise cannot be waited on, then the promise will be rejected.
| mixed | $unwrap |