Repeat Laravel commands every (few) second(s)

app\Console\Commands\RepeatCommand.php

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\Artisan;

class RepeatCommand extends Command
{
    protected $signature = 'repeat-command
        {command-string : The name of the command; extra parameters can be passed by encasing the whole string in double quotes}
        {--duration=60 : The duration in seconds which defines how long the loop will run}
        {--every=10 : The interval of the command}';

    protected $description = 'Run artisan commands more often than once a minute, by defining an interval in seconds and a duration.';

    public function handle()
    {
        $every = $this->option('every');

        $duration = $this->option('duration');

        $command = $this->argument('command-string');

        for ($i = 0; $i < ($duration / $every); $i++) {
            $start = $this->microtime();
            Artisan::call($command, [], $this->output);
            // Sleep for the given number of microseconds, subtracting the execution time.
            sleep_us(($every * 1e6) - ($this->microtime() - $start));
        }
    }

    /**
     * Get the Unix time in microseconds (millionths of a second).
     */
    private function microtime(): int
    {
        return (int)(microtime(true) * 1e6);
    }
}

app\Console\Kernel.php

<?php

// ...

protected function schedule(Schedule $schedule)
{
    $schedule->command(RepeatCommand::class, [
        'somefastcommand', '--every' => 3, '--duration' => 60,
    ])->everyMinute()->runInBackground();
    
    // ...
}

helpers.php

<?php

if (!function_exists('sleep_us')) {
    /**
     * Sleep the script for a given number of microseconds.
     *
     * @param int $microseconds
     * @return void
     */
    function sleep_us($microseconds)
    {
        if ($microseconds < 0) {
            return;
        }
        
        if ($usleep = $microseconds % 1000000) {
            usleep($usleep);
        }

        if ($sleep = ($microseconds - $usleep) / 1000000) {
            sleep($sleep);
        }
    }
}