SWOOLE usage with PHP as backend

Question

I use PHP/Nginx as backend for my App. I was afraid that when many users are calling functions into PHP, it will slow down as PHP does not support Async function calls. I check the below MacOS terminal command to get max calls/second by following command :

wrk -t4 -c100 http://103.22.110.32:80/a.php 

results:

Running 10s test @ http://103.22.110.32:80/a.php
 4 threads and 100 connections
 Thread Stats Avg Stdev Max +/- Stdev
 Latency 111.87ms 30.31ms 430.54ms 93.69%
 Req/Sec 207.00 46.30 313.00 79.08%
 8159 requests in 10.05s, 1.58MB read
 Non-2xx or 3xx responses: 8159
Requests/sec: 812.05
Transfer/sec: 160.98KB

I assume that this means that max concurrent calls are ~800 call/sec. ie if i have eg 80k users , it will wait for ~ 100 second. I checked that SWOOLE can support Async call, making PHP superfast. speed can increase to > 60,000 calls/sec easilty.

Original PHP back end code :

 $tasknum = $request->get['Task'];
 switch ($tasknum) {
 case "task":
 Code for task A
 break;
 case "taskb":
 Code for task B
 break;
 case "taskc":
 Code for task c
 break;
 }

I have used below code for SWOOLE :

use Swoole\Http\Server;
use Swoole\Coroutine;
require_once 'vendor/autoload.php';
 
$server = new Server("0.0.0.0", 81);
$server->on('Request', function ($request, $response) {
 // Handle incoming requests
 $tasknum = $request->get['Task'];
 switch ($tasknum) {
 case "task":
 $response->header("Content-Type", "text/plain");
 $response->end("Task A executed successfully.");
 break;
 case "taskb":
 $response->header("Content-Type", "text/plain");
 $response->end("Task A executed successfully.");
 break;
 case "taskc":
 $response->header("Content-Type", "text/plain");
 $response->end("Task A executed successfully.");
 break;
 case "a":
 $response->header("Content-Type", "text/plain");
 $response->end("ppppirnt aaaa");
 break;
 }
});
$server->start();

Question :

• is this correct approach for to use Swoole , or eg, i can use Croutine ?
• how to call PHP API call with Task =taskc , eg.
• when to start Swoole server, and does it stop , or it is working indefinitely