Test select stream

composer.json

+{
+    "name": "veber/async-test",
+    "require": {
+        "php": ">=7.3",
+        "symfony/http-client": "dev-master",
+        "react/event-loop": "^1.1",
+        "react/promise": "^2.7",
+        "react/stream": "^1.1",
+        "react/promise-stream": "^1.2"
+    },
+    "authors": [
+        {
+            "name": "Maxime Veber",
+            "email": "nek.dev@gmail.com"
+        }
+    ]
+}

server/index.php

+<?php
+
+
+$vars = [];
+
+if (!$_POST) {
+    $_POST = json_decode(file_get_contents('php://input'), true);
+    $_POST['content-type'] = $_SERVER['HTTP_CONTENT_TYPE'] ?? '?';
+}
+
+foreach ($_SERVER as $k => $v) {
+    switch ($k) {
+        default:
+            if (0 !== strpos($k, 'HTTP_')) {
+                continue 2;
+            }
+        // no break
+        case 'SERVER_NAME':
+        case 'SERVER_PROTOCOL':
+        case 'REQUEST_URI':
+        case 'REQUEST_METHOD':
+        case 'PHP_AUTH_USER':
+        case 'PHP_AUTH_PW':
+            $vars[$k] = $v;
+    }
+}
+
+$json = json_encode($vars, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+
+
+switch ($vars['REQUEST_URI']) {
+    case '/long-to-execute':
+        sleep(5);
+        break;
+    case '/faster':
+        sleep(1);
+        break;
+}
+
+header('Content-Type: application/json', true);
+
+echo $json;

test2.php

+<?php
+
+use Symfony\Component\HttpClient\NativeHttpClient;
+
+require 'vendor/autoload.php';
+
+$client = new NativeHttpClient();
+$response1 = $client->request('GET', 'http://localhost:8000/long-to-execute');
+$stream1 = $response1->toStream();
+stream_set_blocking($stream1, 0);
+
+$response2 = $response = $client->request('GET', 'http://localhost:8001/faster');
+$stream2 = $response2->toStream();
+stream_set_blocking($stream2, 0);
+
+$write = [];
+$except = [];
+do {
+    $read = [$stream1, $stream2];
+    $foo = stream_select($read, $write, $except, null, 0);
+
+    foreach ($read as $item) {
+        var_dump(stream_get_contents($item));
+    }
+
+    echo "Stream 1: \n";
+    var_dump(\feof($stream1));
+
+    echo "Stream 2: \n";
+    var_dump(\feof($stream2));
+} while (!\feof($stream1) && !\feof($stream2)); // while streams are not finished
+