diff --git a/src/Handler/Logging.php b/src/Handler/Logging.php
index 88318f68..5cc61f05 100644
--- a/src/Handler/Logging.php
+++ b/src/Handler/Logging.php
@@ -189,7 +189,7 @@ private function collectErrorExceptionData($e)
             $priority  = Logger::$errorPriorityMap[$e->getSeverity()];
             $errorType = HeroConstant::ERROR_TYPE[$e->getSeverity()];
         } else {
-            $errorType = get_class($e);
+            $errorType = \get_class($e);
         }
 
         $errorFile = $e->getFile();
diff --git a/src/Handler/Writer/Db.php b/src/Handler/Writer/Db.php
index 1356ff2e..48352b84 100644
--- a/src/Handler/Writer/Db.php
+++ b/src/Handler/Writer/Db.php
@@ -87,7 +87,7 @@ public function isExists($errorFile, $errorLine, $errorMessage, $errorUrl)
                 $first = $result->current()[$timestamp];
                 $last  = date('Y-m-d H:i:s');
 
-                $diff = strtotime($last) - strtotime($first);
+                $diff = \strtotime($last) - \strtotime($first);
                 if ($diff <= $this->configLoggingSettings['same-error-log-time-range']) {
                     return true;
                 }
diff --git a/src/Handler/Writer/Mail.php b/src/Handler/Writer/Mail.php
index a69d7759..6862c505 100644
--- a/src/Handler/Writer/Mail.php
+++ b/src/Handler/Writer/Mail.php
@@ -56,7 +56,7 @@ public function shutdown()
         }
 
         // Always provide events to mail as plaintext.
-        $body = implode(PHP_EOL, $this->eventsToMail);
+        $body = \implode(PHP_EOL, $this->eventsToMail);
 
         if (! empty($this->requestData['files_data'])) {
             $mimePart = new MimePart($body);
diff --git a/src/HeroTrait.php b/src/HeroTrait.php
index cf4a0f0d..f70ef458 100644
--- a/src/HeroTrait.php
+++ b/src/HeroTrait.php
@@ -62,7 +62,7 @@ public function phpErrorHandler($errorType, $errorMessage, $errorFile, $errorLin
             ini_set('display_errors', 0);
         }
 
-        if (in_array($errorType, $this->errorHeroModuleConfig['display-settings']['exclude-php-errors'])) {
+        if (\in_array($errorType, $this->errorHeroModuleConfig['display-settings']['exclude-php-errors'])) {
             return;
         }
 
diff --git a/src/Listener/Mvc.php b/src/Listener/Mvc.php
index ced722f9..1f2a48a4 100644
--- a/src/Listener/Mvc.php
+++ b/src/Listener/Mvc.php
@@ -81,7 +81,7 @@ public function exceptionError(Event $e)
 
         $exceptionClass = get_class($exception);
         if (isset($this->errorHeroModuleConfig['display-settings']['exclude-exceptions']) &&
-            in_array($exceptionClass, $this->errorHeroModuleConfig['display-settings']['exclude-exceptions'])) {
+            \in_array($exceptionClass, $this->errorHeroModuleConfig['display-settings']['exclude-exceptions'])) {
             // rely on original mvc process
             return;
         }
diff --git a/src/Middleware/Expressive.php b/src/Middleware/Expressive.php
index 30ea0dbc..ac4734f6 100644
--- a/src/Middleware/Expressive.php
+++ b/src/Middleware/Expressive.php
@@ -83,7 +83,7 @@ public function exceptionError($e, $request)
     {
         $exceptionClass = get_class($e);
         if (isset($this->errorHeroModuleConfig['display-settings']['exclude-exceptions']) &&
-            in_array($exceptionClass, $this->errorHeroModuleConfig['display-settings']['exclude-exceptions'])
+            \in_array($exceptionClass, $this->errorHeroModuleConfig['display-settings']['exclude-exceptions'])
         ) {
             throw $e;
         }