Set base language version to PHP 8.0 or higher.

Dockerfile

@@ -1,11 +1,11 @@
-FROM php:7.4-cli-alpine
+FROM php:8.0-cli-alpine
 
 RUN apk add --no-cache zip git curl supervisor
 
 RUN docker-php-ext-install pcntl
 
 RUN apk add --no-cache --virtual .build-deps autoconf build-base \
-    && pecl install xdebug-2.8.1 \
+    && pecl install xdebug-3.1.3 \
     && docker-php-ext-enable xdebug \
     && apk del .build-deps
 

composer.json

@@ -25,26 +25,25 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "require": {
-        "php": ">=7.4",
+        "php": ">=8.0",
         "lstrojny/fxmlrpc": ">=0.12",
         "psr/log": "^1.1"
     },
     "require-dev": {
         "ext-pcntl": "*",
         "ext-posix": "*",
         "behat/behat": "^3.0",
-        "guzzlehttp/guzzle": "^6.0",
+        "guzzlehttp/guzzle": "^7",
         "http-interop/http-factory-guzzle": "^1.0",
-        "overtrue/phplint": "^2.0",
-        "php-http/guzzle6-adapter": "^2.0",
+        "overtrue/phplint": "^3.0",
         "php-http/httplug": "^2.1",
         "php-http/message": "^1.8",
-        "php-parallel-lint/php-console-highlighter": "^0.5.0",
+        "php-parallel-lint/php-console-highlighter": "^1",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpspec/phpspec": "^7",
         "phpstan/phpstan": "^1",
         "phpstan/phpstan-strict-rules": "^1",
-        "roave/security-advisories": "dev-master",
+        "roave/security-advisories": "dev-latest",
         "supervisorphp/configuration": "^0.3"
     },
     "scripts": {

features/bootstrap/FeatureContext.php

@@ -52,9 +52,9 @@ protected function setUpConnector()
 
         $client = new Client(
             'http://127.0.0.1:9001/RPC2',
-            new HttpAdapterTransport(
-                new \Http\Message\MessageFactory\GuzzleMessageFactory(),
-                new \Http\Adapter\Guzzle6\Client($guzzleClient)
+            new \fXmlRpc\Transport\PsrTransport(
+                new \Http\Factory\Guzzle\RequestFactory(),
+                $guzzleClient
             )
         );
 

src/Process.php

@@ -62,8 +62,7 @@ public function __toString(): string
     /**
      * @inheritDoc
      */
-    #[ReturnTypeWillChange]
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return $this->payload[$offset] ?? null;
     }