spawn
(PHP 8.6+, True Async 1.0)
spawn() — Launches a function for execution in a new coroutine. Creates a coroutine.
Description
spawn(callable $callback, mixed ...$args): Async\CoroutineCreates and starts a new coroutine. The coroutine will be executed asynchronously.
Parameters
callback A function or closure to execute in the coroutine. Can be any valid callable type.
args Optional parameters passed to callback. Parameters are passed by value.
Return Values
Returns an Async\Coroutine object representing the launched coroutine. The object can be used to:
- Obtain the result via
await() - Cancel execution via
cancel() - Check the coroutine's state
Examples
Example #1 Basic usage of spawn()
<?php
use function Async\spawn;
use function Async\await;
function fetchData(string $url): string {
return file_get_contents($url);
}
$coroutine = spawn(fetchData(...), 'https://php.net');
// The coroutine executes asynchronously
echo "Coroutine started\n";
$result = await($coroutine);
echo "Result received\n";
?>Example #2 Multiple coroutines
<?php
use function Async\spawn;
use function Async\await;
$urls = [
'https://php.net',
'https://github.com',
'https://stackoverflow.com'
];
$coroutines = [];
foreach ($urls as $url) {
$coroutines[] = spawn(file_get_contents(...), $url);
}
// All requests execute concurrently
foreach ($coroutines as $coro) {
$content = await($coro);
echo "Downloaded: " . strlen($content) . " bytes\n";
}
?>Example #3 Using with a closure
<?php
use function Async\spawn;
use function Async\await;
$userId = 123;
$coroutine = spawn(function() use ($userId) {
$userData = file_get_contents("https://api/users/$userId");
$userOrders = file_get_contents("https://api/orders?user=$userId");
return [
'user' => json_decode($userData),
'orders' => json_decode($userOrders)
];
});
$data = await($coroutine);
print_r($data);
?>Example #4 spawn with Scope
<?php
use function Async\spawn;
use Async\Scope;
$scope = new Scope();
$scope->spawn(function() {
echo "Coroutine 1\n";
});
$scope->spawn(function() {
echo "Coroutine 2\n";
});
// Wait for all coroutines in the scope to complete
$scope->awaitCompletion();
?>Example #5 Passing parameters
<?php
use function Async\spawn;
use function Async\await;
function calculateSum(int $a, int $b, int $c): int {
return $a + $b + $c;
}
$coroutine = spawn(calculateSum(...), 10, 20, 30);
$result = await($coroutine);
echo "Sum: $result\n"; // Sum: 60
?>Example #6 Error handling
One way to handle an exception from a coroutine is to use the await() function:
<?php
use function Async\spawn;
use function Async\await;
$coroutine = spawn(function() {
if (rand(0, 1)) {
throw new Exception("Random error");
}
return "Success";
});
try {
$result = await($coroutine);
echo $result;
} catch (Exception $e) {
echo "Error: " . $e->getMessage();
}
?>Notes
Note: Coroutines created via
spawn()execute concurrently, but not in parallel. PHP TrueAsync uses a single-threaded execution model.
Note: Parameters are passed to the coroutine by value. To pass by reference, use a closure with
use (&$var).
Changelog
| Version | Description |
|---|---|
| 1.0.0 | Added the spawn() function |