diff --git a/rector.php b/rector.php
index d0654af14..be2a4b6d8 100644
--- a/rector.php
+++ b/rector.php
@@ -14,5 +14,5 @@ return RectorConfig::configure()
     ])
     ->withImportNames(importShortClasses: false)
     ->withAttributesSets(doctrine: true)
-    ->withPhpSets(php55: true)
+    ->withPhpSets(php70: true)
     ->withTypeCoverageLevel(0);
diff --git a/src/Controller/EntryController.php b/src/Controller/EntryController.php
index 7f184d2b5..e1ee1212c 100644
--- a/src/Controller/EntryController.php
+++ b/src/Controller/EntryController.php
@@ -626,7 +626,7 @@ class EntryController extends AbstractController
     private function showEntries($type, Request $request, $page)
     {
         $searchTerm = (isset($request->query->all('search_entry')['term']) ? trim($request->query->all('search_entry')['term']) : '');
-        $currentRoute = (null !== $request->query->get('currentRoute') ? $request->query->get('currentRoute') : '');
+        $currentRoute = $request->query->get('currentRoute') ?? '';
         $currentEntryId = $request->attributes->getInt('id');
 
         $formOptions = [];
diff --git a/src/Controller/ExportController.php b/src/Controller/ExportController.php
index ce622a956..64f75c3a2 100644
--- a/src/Controller/ExportController.php
+++ b/src/Controller/ExportController.php
@@ -77,8 +77,8 @@ class ExportController extends AbstractController
 
             $title = 'Tag ' . $tag->getLabel();
         } elseif ('search' === $category) {
-            $searchTerm = (isset($request->query->all('search_entry')['term']) ? $request->query->all('search_entry')['term'] : '');
-            $currentRoute = (null !== $request->query->get('currentRoute') ? $request->query->get('currentRoute') : '');
+            $searchTerm = $request->query->all('search_entry')['term'] ?? '';
+            $currentRoute = $request->query->get('currentRoute') ?? '';
 
             $entries = $entryRepository->getBuilderForSearchByUser(
                 $this->getUser()->getId(),
diff --git a/src/Controller/UserController.php b/src/Controller/UserController.php
index 5be29a6cc..58e069926 100644
--- a/src/Controller/UserController.php
+++ b/src/Controller/UserController.php
@@ -161,7 +161,7 @@ class UserController extends AbstractController
         $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {
-            $searchTerm = (isset($request->query->all('search_user')['term']) ? $request->query->all('search_user')['term'] : '');
+            $searchTerm = $request->query->all('search_user')['term'] ?? '';
 
             $qb = $userRepository->getQueryBuilderForSearch($searchTerm);
         }
diff --git a/src/Helper/ContentProxy.php b/src/Helper/ContentProxy.php
index bfdc9f163..aefa8eeb0 100644
--- a/src/Helper/ContentProxy.php
+++ b/src/Helper/ContentProxy.php
@@ -59,7 +59,7 @@ class ContentProxy
 
             $fetchedContent['title'] = $this->sanitizeContentTitle(
                 $fetchedContent['title'],
-                isset($fetchedContent['headers']['content-type']) ? $fetchedContent['headers']['content-type'] : ''
+                $fetchedContent['headers']['content-type'] ?? ''
             );
 
             // when content is imported, we have information in $content
diff --git a/src/SiteConfig/ArraySiteConfigBuilder.php b/src/SiteConfig/ArraySiteConfigBuilder.php
index d150650c4..188ca42c9 100644
--- a/src/SiteConfig/ArraySiteConfigBuilder.php
+++ b/src/SiteConfig/ArraySiteConfigBuilder.php
@@ -25,10 +25,6 @@ class ArraySiteConfigBuilder implements SiteConfigBuilder
             $host = substr($host, 4);
         }
 
-        if (isset($this->configs[$host])) {
-            return $this->configs[$host];
-        }
-
-        return false;
+        return $this->configs[$host] ?? false;
     }
 }