diff --git a/src/Wallabag/CoreBundle/Form/Type/EntryFilterType.php b/src/Wallabag/CoreBundle/Form/Type/EntryFilterType.php
index 702c7f7aa..37d0640a6 100644
--- a/src/Wallabag/CoreBundle/Form/Type/EntryFilterType.php
+++ b/src/Wallabag/CoreBundle/Form/Type/EntryFilterType.php
@@ -108,7 +108,7 @@ class EntryFilterType extends AbstractType
             ->add('httpStatus', TextFilterType::class, [
                 'apply_filter' => function (QueryInterface $filterQuery, $field, $values) {
                     $value = $values['value'];
-                    if (false === array_key_exists($value, Response::$statusTexts)) {
+                    if (false === \array_key_exists($value, Response::$statusTexts)) {
                         return;
                     }
 
diff --git a/src/Wallabag/CoreBundle/Helper/PreparePagerForEntries.php b/src/Wallabag/CoreBundle/Helper/PreparePagerForEntries.php
index 1c2c50931..183d394a0 100644
--- a/src/Wallabag/CoreBundle/Helper/PreparePagerForEntries.php
+++ b/src/Wallabag/CoreBundle/Helper/PreparePagerForEntries.php
@@ -23,7 +23,7 @@ class PreparePagerForEntries
      * @param AdapterInterface $adapter
      * @param User             $user    If user isn't logged in, we can force it (like for rss)
      *
-     * @return null|Pagerfanta
+     * @return Pagerfanta|null
      */
     public function prepare(AdapterInterface $adapter, User $user = null)
     {
diff --git a/src/Wallabag/CoreBundle/Repository/SiteCredentialRepository.php b/src/Wallabag/CoreBundle/Repository/SiteCredentialRepository.php
index 369067612..b2e212a41 100644
--- a/src/Wallabag/CoreBundle/Repository/SiteCredentialRepository.php
+++ b/src/Wallabag/CoreBundle/Repository/SiteCredentialRepository.php
@@ -22,7 +22,7 @@ class SiteCredentialRepository extends \Doctrine\ORM\EntityRepository
      * @param string $host
      * @param int    $userId
      *
-     * @return null|array
+     * @return array|null
      */
     public function findOneByHostAndUser($host, $userId)
     {
diff --git a/src/Wallabag/ImportBundle/Import/BrowserImport.php b/src/Wallabag/ImportBundle/Import/BrowserImport.php
index 4678ae0c5..811e3fb8a 100644
--- a/src/Wallabag/ImportBundle/Import/BrowserImport.php
+++ b/src/Wallabag/ImportBundle/Import/BrowserImport.php
@@ -77,7 +77,7 @@ abstract class BrowserImport extends AbstractImport
      */
     public function parseEntry(array $importedEntry)
     {
-        if ((!array_key_exists('guid', $importedEntry) || (!array_key_exists('id', $importedEntry))) && \is_array(reset($importedEntry))) {
+        if ((!\array_key_exists('guid', $importedEntry) || (!\array_key_exists('id', $importedEntry))) && \is_array(reset($importedEntry))) {
             if ($this->producer) {
                 $this->parseEntriesForProducer($importedEntry);
 
@@ -89,7 +89,7 @@ abstract class BrowserImport extends AbstractImport
             return;
         }
 
-        if (array_key_exists('children', $importedEntry)) {
+        if (\array_key_exists('children', $importedEntry)) {
             if ($this->producer) {
                 $this->parseEntriesForProducer($importedEntry['children']);
 
@@ -101,11 +101,11 @@ abstract class BrowserImport extends AbstractImport
             return;
         }
 
-        if (!array_key_exists('uri', $importedEntry) && !array_key_exists('url', $importedEntry)) {
+        if (!\array_key_exists('uri', $importedEntry) && !\array_key_exists('url', $importedEntry)) {
             return;
         }
 
-        $url = array_key_exists('uri', $importedEntry) ? $importedEntry['uri'] : $importedEntry['url'];
+        $url = \array_key_exists('uri', $importedEntry) ? $importedEntry['uri'] : $importedEntry['url'];
 
         $existingEntry = $this->em
             ->getRepository('WallabagCoreBundle:Entry')
@@ -126,7 +126,7 @@ abstract class BrowserImport extends AbstractImport
         // update entry with content (in case fetching failed, the given entry will be return)
         $this->fetchContent($entry, $data['url'], $data);
 
-        if (array_key_exists('tags', $data)) {
+        if (\array_key_exists('tags', $data)) {
             $this->tagsAssigner->assignTagsToEntry(
                 $entry,
                 $data['tags']
diff --git a/src/Wallabag/ImportBundle/Import/ChromeImport.php b/src/Wallabag/ImportBundle/Import/ChromeImport.php
index eccee6986..4ae82ade8 100644
--- a/src/Wallabag/ImportBundle/Import/ChromeImport.php
+++ b/src/Wallabag/ImportBundle/Import/ChromeImport.php
@@ -57,7 +57,7 @@ class ChromeImport extends BrowserImport
             'created_at' => substr($entry['date_added'], 0, 10),
         ];
 
-        if (array_key_exists('tags', $entry) && '' !== $entry['tags']) {
+        if (\array_key_exists('tags', $entry) && '' !== $entry['tags']) {
             $data['tags'] = $entry['tags'];
         }
 
diff --git a/src/Wallabag/ImportBundle/Import/FirefoxImport.php b/src/Wallabag/ImportBundle/Import/FirefoxImport.php
index 8999e3f39..b3558f21e 100644
--- a/src/Wallabag/ImportBundle/Import/FirefoxImport.php
+++ b/src/Wallabag/ImportBundle/Import/FirefoxImport.php
@@ -57,7 +57,7 @@ class FirefoxImport extends BrowserImport
             'created_at' => substr($entry['dateAdded'], 0, 10),
         ];
 
-        if (array_key_exists('tags', $entry) && '' !== $entry['tags']) {
+        if (\array_key_exists('tags', $entry) && '' !== $entry['tags']) {
             $data['tags'] = $entry['tags'];
         }
 
diff --git a/src/Wallabag/ImportBundle/Import/InstapaperImport.php b/src/Wallabag/ImportBundle/Import/InstapaperImport.php
index 5a18c7c0c..3a9f08b4a 100644
--- a/src/Wallabag/ImportBundle/Import/InstapaperImport.php
+++ b/src/Wallabag/ImportBundle/Import/InstapaperImport.php
@@ -62,7 +62,7 @@ class InstapaperImport extends AbstractImport
         }
 
         $entries = [];
-        $handle = fopen($this->filepath, 'rb');
+        $handle = fopen($this->filepath, 'r');
         while (false !== ($data = fgetcsv($handle, 10240))) {
             if ('URL' === $data[0]) {
                 continue;
diff --git a/src/Wallabag/ImportBundle/Import/WallabagImport.php b/src/Wallabag/ImportBundle/Import/WallabagImport.php
index 350d06001..58b6a9704 100644
--- a/src/Wallabag/ImportBundle/Import/WallabagImport.php
+++ b/src/Wallabag/ImportBundle/Import/WallabagImport.php
@@ -122,7 +122,7 @@ abstract class WallabagImport extends AbstractImport
         // update entry with content (in case fetching failed, the given entry will be return)
         $this->fetchContent($entry, $data['url'], $data);
 
-        if (array_key_exists('tags', $data)) {
+        if (\array_key_exists('tags', $data)) {
             $this->tagsAssigner->assignTagsToEntry(
                 $entry,
                 $data['tags'],
diff --git a/src/Wallabag/ImportBundle/Import/WallabagV1Import.php b/src/Wallabag/ImportBundle/Import/WallabagV1Import.php
index b9bb525ab..e05626117 100644
--- a/src/Wallabag/ImportBundle/Import/WallabagV1Import.php
+++ b/src/Wallabag/ImportBundle/Import/WallabagV1Import.php
@@ -61,7 +61,7 @@ class WallabagV1Import extends WallabagImport
             $data['html'] = $this->fetchingErrorMessage;
         }
 
-        if (array_key_exists('tags', $entry) && '' !== $entry['tags']) {
+        if (\array_key_exists('tags', $entry) && '' !== $entry['tags']) {
             $data['tags'] = $entry['tags'];
         }