diff --git a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
index f86cb1c7a2244..b0c48d72a9797 100644
--- a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
+++ b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
@@ -255,7 +255,7 @@ protected function doSave(array $values, int $lifetime)
     protected function doFetch(array $ids)
     {
         try {
-            $encodedIds = array_map('self::encodeKey', $ids);
+            $encodedIds = array_map([__CLASS__, 'encodeKey'], $ids);
 
             $encodedResult = $this->checkResultCode($this->getClient()->getMulti($encodedIds));
 
@@ -284,7 +284,7 @@ protected function doHave($id)
     protected function doDelete(array $ids)
     {
         $ok = true;
-        $encodedIds = array_map('self::encodeKey', $ids);
+        $encodedIds = array_map([__CLASS__, 'encodeKey'], $ids);
         foreach ($this->checkResultCode($this->getClient()->deleteMulti($encodedIds)) as $result) {
             if (\Memcached::RES_SUCCESS !== $result && \Memcached::RES_NOTFOUND !== $result) {
                 $ok = false;
diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index 089de76bd63e0..0516545bc9bc7 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -207,7 +207,7 @@ protected function formatChoiceQuestionChoices(ChoiceQuestion $question, $tag)
     {
         $messages = [];
 
-        $maxWidth = max(array_map('self::strlen', array_keys($choices = $question->getChoices())));
+        $maxWidth = max(array_map([__CLASS__, 'strlen'], array_keys($choices = $question->getChoices())));
 
         foreach ($choices as $key => $value) {
             $padding = str_repeat(' ', $maxWidth - self::strlen($key));