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38 lines
1.3 KiB
PHP
38 lines
1.3 KiB
PHP
<?php
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require __DIR__ . '/../../vendor/autoload.php';
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use Amp\Delayed;
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use Amp\Loop;
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use function Amp\async;
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use function Amp\await;
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// Note that the closure declares int as a return type, not Promise or Generator, but executes like a coroutine.
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$callback = function (int $id): int {
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return await(new Delayed(1000, $id)); // Await promise resolution.
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};
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$timer = Loop::repeat(100, function () {
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echo ".", PHP_EOL; // This repeat timer is to show the loop is not being blocked.
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});
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Loop::unreference($timer); // Unreference timer so the loop exits automatically when all tasks complete.
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// Invoking $callback returns an int, but is executed asynchronously.
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$result = $callback(1); // Call a subroutine within this green thread, taking 1 second to return.
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\var_dump($result);
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// Simultaneously runs two new green threads, await their resolution in this green thread.
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$result = await([ // Executed simultaneously, only 1 second will elapse during this await.
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async($callback, 2),
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async($callback, 3),
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]);
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\var_dump($result); // Executed after 2 seconds.
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$result = $callback(4); // Call takes 1 second to return.
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\var_dump($result);
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// array_map() takes 2 seconds to execute as the calls are not concurrent, but this shows that fibers are
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// supported by internal callbacks.
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$result = \array_map($callback, [5, 6]);
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\var_dump($result);
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