Swoole coroutines

coroutine.php

<?php

use Swoole\Coroutine as Co;

Co\run(function () {
    for ($i = 0; $i < 100; $i++) {
        go(function () use($i) {
            usleep(1_000_00 * mt_rand(1,10));
            echo "Coroutine $i is done.\n";
        });
    }
});

echo "Outside any Coroutine Context.\n";