Fixes #5657: `yii\caching\ApcCache::mset()` and `madd()` may cause warning in some APC setup

framework/CHANGELOG.md

@@ -8,6 +8,7 @@ Yii Framework 2 Change Log
 - Bug #5402: Debugger was not loading when there were closures in asset classes (samdark)
 - Bug #5584: `yii\rbac\DbRbacManager` should not delete items when deleting a rule on a database not supporting cascade update (mdmunir)
 - Bug #5601: Simple conditions in Query::where() and ActiveQuery::where() did not allow `yii\db\Expression` to be used as the value (cebe, stevekr)
+- Bug #5657: `yii\caching\ApcCache::mset()` and `madd()` may cause warning in some APC setup (LAV45)
 - Bug #5665: The `currentPage` meta data in the RESTful result should be 1-based, similar to that in HTTP headers (qiangxue)
 - Bug: Gii console command help information does not contain global options (qiangxue)
 - Enh #5223: Query builder now supports selecting sub-queries as columns (qiangxue)

framework/caching/ApcCache.php

@@ -56,10 +56,7 @@ class ApcCache extends Cache
     protected function getValues($keys)
     {
         $values = apc_fetch($keys);
-        if ($values === false) {
-            $values = [];
-        }
-        return $values;
+        return is_array($values) ? $values : [];
     }
 
     /**
@@ -84,7 +81,8 @@ class ApcCache extends Cache
      */
     protected function setValues($data, $duration)
     {
-        return array_keys(apc_store($data, null, $duration));
+        $result = apc_store($data, null, $duration);
+        return is_array($result) ? array_keys($result) : [];
     }
 
     /**
@@ -108,7 +106,8 @@ class ApcCache extends Cache
      */
     protected function addValues($data, $duration)
     {
-        return array_keys(apc_add($data, null, $duration));
+        $result = apc_add($data, null, $duration);
+        return is_array($result) ? array_keys($result) : [];
     }
 
     /**