Add implicit nullable parameters

src/fXmlRpc/Client.php

@@ -59,16 +59,16 @@ final class Client implements ClientInterface
      * If no specific transport, parser or serializer is passed, default implementations
      * are used.
      *
-     * @param string                         $uri
+     * @param null|string                         $uri
      * @param TransportInterface             $transport
      * @param Parser\ParserInterface         $parser
      * @param Serializer\SerializerInterface $serializer
      */
     public function __construct(
         $uri = null,
-        TransportInterface $transport = null,
-        ParserInterface $parser = null,
-        SerializerInterface $serializer = null
+        ?TransportInterface $transport = null,
+        ?ParserInterface $parser = null,
+        ?SerializerInterface $serializer = null
     )
     {
         $this->uri = $uri;

src/fXmlRpc/Exception/HttpException.php

@@ -27,7 +27,7 @@
 
 final class HttpException extends AbstractTransportException
 {
-    public static function httpError($message, $statusCode, Exception $previous = null)
+    public static function httpError($message, $statusCode, ?Exception $previous = null)
     {
         return new static('An HTTP error occurred: ' . $message, $statusCode, $previous);
     }

src/fXmlRpc/MulticallBuilder.php

@@ -52,7 +52,7 @@ public function __construct(ClientInterface $client)
     }
 
     /** {@inheritdoc} */
-    public function addCall($methodName, array $params = [], callable $onSuccess = null, callable $onError = null)
+    public function addCall($methodName, array $params = [], ?callable $onSuccess = null, ?callable $onError = null)
     {
         if (!is_string($methodName)) {
             throw InvalidArgumentException::expectedParameter(1, 'string', $methodName);

src/fXmlRpc/MulticallBuilderInterface.php

@@ -50,11 +50,11 @@ public function onError(callable $handler);
      *
      * @param string $methodName
      * @param array $params
-     * @param callable $onSuccess
-     * @param callable $onError
+     * @param null|callable $onSuccess
+     * @param null|callable $onError
      * @return MulticallBuilderInterface
      */
-    public function addCall($methodName, array $params = [], callable $onSuccess = null, callable $onError = null);
+    public function addCall($methodName, array $params = [], ?callable $onSuccess = null, ?callable $onError = null);
 
     /**
      * Send the multicall request to the server

src/fXmlRpc/Proxy.php

@@ -40,7 +40,7 @@ class Proxy
     /**
      * @param ClientInterface $client
      * @param string          $namespaceSeparator
-     * @param string          $namespace
+     * @param null|string     $namespace
      */
     public function __construct(ClientInterface $client, $namespaceSeparator = '.', $namespace = null)
     {

src/fXmlRpc/Timing/Psr3TimerBridge.php

@@ -34,9 +34,9 @@ final class Psr3TimerBridge extends AbstractTimerBridge
      * Allows passing custom log level and message template (with sprintf() control characters) for log message
      * customization
      *
-     * @param LoggerInterface $logger
-     * @param integer         $level
-     * @param string          $messageTemplate
+     * @param LoggerInterface      $logger
+     * @param null|integer         $level
+     * @param null|string          $messageTemplate
      */
     public function __construct(LoggerInterface $logger, $level = null, $messageTemplate = null)
     {

src/fXmlRpc/Timing/ZendFrameworkOneTimerBridge.php

@@ -34,9 +34,9 @@ final class ZendFrameworkOneTimerBridge extends AbstractTimerBridge
      * Allows passing custom log level and message template (with sprintf() control characters) for log message
      * customization
      *
-     * @param Log $logger
-     * @param integer  $level
-     * @param string   $messageTemplate
+     * @param Log           $logger
+     * @param null|integer  $level
+     * @param null|string   $messageTemplate
      */
     public function __construct(Log $logger, $level = null, $messageTemplate = null)
     {

src/fXmlRpc/Timing/ZendFrameworkTwoTimerBridge.php

@@ -34,9 +34,9 @@ final class ZendFrameworkTwoTimerBridge extends AbstractTimerBridge
      * Allows passing custom log level and message template (with sprintf() control characters) for log message
      * customization
      *
-     * @param LoggerInterface $logger
-     * @param string          $method
-     * @param string          $messageTemplate
+     * @param LoggerInterface      $logger
+     * @param null|string          $method
+     * @param null|string          $messageTemplate
      */
     public function __construct(LoggerInterface $logger, $method = null, $messageTemplate = null)
     {