diff --git a/src/Event/DefaultActionEvent.php b/src/Event/DefaultActionEvent.php
index 1933528..6f79012 100644
--- a/src/Event/DefaultActionEvent.php
+++ b/src/Event/DefaultActionEvent.php
@@ -118,8 +118,8 @@ public function setTarget($target): void
      */
     public function setParams($params): void
     {
-        if (! is_array($params) && ! $params instanceof \ArrayAccess) {
-            throw new \InvalidArgumentException('Event params are invalid. Expected type is array or \\ArrayAccess. Got ' . gettype($params));
+        if (! \is_array($params) && ! $params instanceof \ArrayAccess) {
+            throw new \InvalidArgumentException('Event params are invalid. Expected type is array or \\ArrayAccess. Got ' . \gettype($params));
         }
 
         $this->params = $params;
diff --git a/src/Event/ProophActionEventEmitter.php b/src/Event/ProophActionEventEmitter.php
index b7c7bf4..efbe6e3 100644
--- a/src/Event/ProophActionEventEmitter.php
+++ b/src/Event/ProophActionEventEmitter.php
@@ -88,7 +88,7 @@ public function dispatchUntil(ActionEvent $event, callable $callback): void
      */
     public function attachListener(string $event, callable $listener, int $priority = 1): ListenerHandler
     {
-        if (! empty($this->availableEventNames) && ! in_array($event, $this->availableEventNames, true)) {
+        if (! empty($this->availableEventNames) && ! \in_array($event, $this->availableEventNames, true)) {
             throw new \InvalidArgumentException("Unknown event name given: $event");
         }
 
@@ -135,7 +135,7 @@ private function getListeners(ActionEvent $event): iterable
     {
         $prioritizedListeners = $this->events[$event->getName()] ?? [];
 
-        krsort($prioritizedListeners, SORT_NUMERIC);
+        \krsort($prioritizedListeners, SORT_NUMERIC);
 
         foreach ($prioritizedListeners as $listenersByPriority) {
             foreach ($listenersByPriority as $listenerHandler) {
diff --git a/src/Messaging/DomainMessage.php b/src/Messaging/DomainMessage.php
index 16c79ca..57921a8 100644
--- a/src/Messaging/DomainMessage.php
+++ b/src/Messaging/DomainMessage.php
@@ -49,7 +49,7 @@ public static function fromArray(array $messageData): DomainMessage
     {
         MessageDataAssertion::assert($messageData);
 
-        $messageRef = new \ReflectionClass(get_called_class());
+        $messageRef = new \ReflectionClass(\get_called_class());
 
         /** @var $message DomainMessage */
         $message = $messageRef->newInstanceWithoutConstructor();
@@ -70,7 +70,7 @@ protected function init(): void
         }
 
         if ($this->messageName === null) {
-            $this->messageName = get_class($this);
+            $this->messageName = \get_class($this);
         }
 
         if ($this->createdAt === null) {
diff --git a/src/Messaging/FQCNMessageFactory.php b/src/Messaging/FQCNMessageFactory.php
index 48793b8..f5859db 100644
--- a/src/Messaging/FQCNMessageFactory.php
+++ b/src/Messaging/FQCNMessageFactory.php
@@ -20,12 +20,12 @@ class FQCNMessageFactory implements MessageFactory
 {
     public function createMessageFromArray(string $messageName, array $messageData): Message
     {
-        if (! class_exists($messageName)) {
+        if (! \class_exists($messageName)) {
             throw new \UnexpectedValueException('Given message name is not a valid class: ' . (string) $messageName);
         }
 
-        if (! is_subclass_of($messageName, DomainMessage::class)) {
-            throw new \UnexpectedValueException(sprintf(
+        if (! \is_subclass_of($messageName, DomainMessage::class)) {
+            throw new \UnexpectedValueException(\sprintf(
                 'Message class %s is not a sub class of %s',
                 $messageName,
                 DomainMessage::class
diff --git a/src/Messaging/MessageDataAssertion.php b/src/Messaging/MessageDataAssertion.php
index f3b3f19..ff299ec 100644
--- a/src/Messaging/MessageDataAssertion.php
+++ b/src/Messaging/MessageDataAssertion.php
@@ -59,7 +59,7 @@ public static function assertPayload($payload): void
      */
     private static function assertSubPayload($payload): void
     {
-        if (is_array($payload)) {
+        if (\is_array($payload)) {
             foreach ($payload as $subPayload) {
                 self::assertSubPayload($subPayload);
             }
@@ -76,16 +76,16 @@ public static function assertMetadata($metadata): void
 
         foreach ($metadata as $key => $value) {
             Assertion::minLength($key, 1, 'A metadata key must be non empty string');
-            Assertion::scalar($value, 'A metadata value must have a scalar type. Got ' . gettype($value) . ' for ' . $key);
+            Assertion::scalar($value, 'A metadata value must have a scalar type. Got ' . \gettype($value) . ' for ' . $key);
         }
     }
 
     public static function assertCreatedAt($createdAt): void
     {
-        Assertion::isInstanceOf($createdAt, DateTimeImmutable::class, sprintf(
+        Assertion::isInstanceOf($createdAt, DateTimeImmutable::class, \sprintf(
             'created_at must be of type %s. Got %s',
             DateTimeImmutable::class,
-            is_object($createdAt) ? get_class($createdAt) : gettype($createdAt)
+            \is_object($createdAt) ? \get_class($createdAt) : \gettype($createdAt)
         ));
     }
 }