an example of how we can create a concurrent http pool using multi curl in php...

http_pool.php

class Response
{
    public function __construct(private string $body, private CurlHandle $curlHandle)
    {
    }

    public function body(): string
    {
        return $this->body;
    }

    public function ok(): bool
    {
        return 200 === $this->status();
    }

    public function status(): int
    {
        return curl_getinfo($this->curlHandle, CURLINFO_HTTP_CODE);
    }

    public function __toString(): string
    {
        return $this->body;
    }
}

/**
 * @author Dılo sürücü
 */
class Http
{
    private CurlHandle $curlHandle;

    public function __construct()
    {
        $this->curlHandle = curl_init();
    }

    /**
     * @return CurlHandle
     */
    public function getCurlHandle(): CurlHandle
    {
        return $this->curlHandle;
    }


    public function get(): self
    {
        curl_setopt($this->curlHandle, CURLOPT_HTTPGET, 1);
        return $this;
    }

    public function put(array $payload = []): self
    {
        curl_setopt($this->curlHandle, CURLOPT_PUT, 1);
        curl_setopt($this->curlHandle, CURLOPT_POSTFIELDS, $payload);
        return $this;
    }

    public function post(array $payload = []): self
    {
        curl_setopt($this->curlHandle, CURLOPT_POST, 1);
        curl_setopt($this->curlHandle, CURLOPT_POSTFIELDS, $payload);
        return $this;
    }

    public function url(string $url): self
    {
        curl_setopt($this->curlHandle, CURLOPT_URL, $url);
        curl_setopt($this->curlHandle, CURLOPT_RETURNTRANSFER, true);
        return $this;
    }
}

class Pool
{
    private CurlMultiHandle $curlMultiHandle;

    /**
     * @var array<string,Http>
     */
    private array $aliases = [];

    public function __construct()
    {
        $this->curlMultiHandle = curl_multi_init();
    }

    public function as(string $alias): Http
    {
        return $this->aliases[$alias] = new Http();
    }


    /**
     * @return array<Response<>>
     */
    public function getResponses(): array
    {
        $this->bindHttp();
        $this->execAllCurls();

        $responses = [];
        foreach ($this->aliases as $as => $http) {
            $responses[$as] = new Response(
                curl_multi_getcontent($http->getCurlHandle()),
                $http->getCurlHandle()
            );

        }

        return $responses;

    }

    /***
     * @return void
     */
    private function execAllCurls(): void
    {
        do {
            curl_multi_exec($this->curlMultiHandle, $still_running);
        } while ($still_running);

    }

    private function bindHttp(): void
    {
        foreach ($this->aliases as $http) {
            curl_multi_add_handle($this->curlMultiHandle, $http->getCurlHandle());
        }
    }
}

    

the using

$pool = new Pool();

$pool
    ->as('google')
    ->url('https://www.google.com')
    ->post(['name' => 'Dılo sürücü']);

$pool
    ->as('youtube')
    ->url('https://www.youtube.com')
    ->get();
$pool
    ->as('linkedin')
    ->url('https://www.linkedin.com')
    ->put([]);
    
$responses = $pool->getResponses();

$linkedin = $responses['linkedin'];
$youtube = $responses['youtube'];

echo $linkedin; //can print directly response 

echo $linkedin->ok();
echo $linkedin->status();
echo $linkedin->body();


echo $youtube->ok();
echo $youtube->body();
echo $youtube->status();