Create basic backend tutorial for PHP

basic/backend/php/.env

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+LIVEKIT_API_KEY=devkey
+LIVEKIT_API_SECRET=secret

basic/backend/php/.gitignore

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+composer.phar
+/vendor/
+
+# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control
+# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
+# composer.lock

basic/backend/php/composer.json

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+{
+    "name": "openvidu/basic-php",
+    "description": "Basic server application built for PHP",
+    "type": "project",
+    "require": {
+        "vlucas/phpdotenv": "^5.6",
+        "agence104/livekit-server-sdk": "^1.2"
+    },
+    "authors": [
+        {
+            "name": "openvidu"
+        }
+    ],
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": true
+        }
+    },
+    "scripts": {
+        "start": "php -S localhost:6080"
+    }
+}

basic/backend/php/index.php

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+<?php
+require __DIR__ . '/vendor/autoload.php';
+
+use Agence104\LiveKit\AccessToken;
+use Agence104\LiveKit\AccessTokenOptions;
+use Agence104\LiveKit\VideoGrant;
+use Dotenv\Dotenv;
+
+Dotenv::createImmutable(__DIR__)->safeLoad();
+
+header("Access-Control-Allow-Origin: *");
+header("Content-Type: application/json; charset=UTF-8");
+header("Access-Control-Allow-Methods: OPTIONS,GET,POST,PUT,DELETE");
+header("Access-Control-Max-Age: 3600");
+header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");
+
+$LIVEKIT_API_KEY = $_ENV['LIVEKIT_API_KEY'] ?? 'devkey';
+$LIVEKIT_API_SECRET = $_ENV['LIVEKIT_API_SECRET'] ?? 'secret';
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST' && $_SERVER['PATH_INFO'] === '/token') {
+    $data = json_decode(file_get_contents('php://input'), true);
+
+    $roomName = $data['roomName'] ?? null;
+    $participantName = $data['participantName'] ?? null;
+
+    if (!$roomName || !$participantName) {
+        http_response_code(400);
+        echo "roomName and participantName are required";
+        exit();
+    }
+
+    $tokenOptions = (new AccessTokenOptions())
+        ->setIdentity($participantName);
+    $videoGrant = (new VideoGrant())
+        ->setRoomJoin()
+        ->setRoomName($roomName);
+    $token = (new AccessToken($LIVEKIT_API_KEY, $LIVEKIT_API_SECRET))
+        ->init($tokenOptions)
+        ->setGrant($videoGrant)
+        ->toJwt();
+    
+    echo $token;
+    exit();
+}
+
+echo "Unsupported endpoint or method";
+exit();