Sync with Joomla PR joomla#11565

libraries/joomla/cache/storage/memcache.php

@@ -347,13 +347,12 @@ public function remove($id, $group)
 		if (isset($index2[$cache_id_sfx]))
 		{
 			unset($index2[$cache_id_sfx]);
-			static::$_db->replace($index2key, $index2, 0, 0);
+			static::$_db->set($index2key, $index2, 0, 0);
 		}
 
-		$result = static::$_db->delete($cache_id);
 		$this->unlockindex($group_key);
 
-		return $result;
+		return static::$_db->delete($cache_id);
 	}
 
 	/**
@@ -399,7 +398,7 @@ public function clean($group, $mode = null)
 				unset($index2[$cache_id_sfx]);
 			}
 
-			static::$_db->replace($index2key, $index2, 0, 0);
+			static::$_db->set($index2key, $index2, 0, 0);
 			$this->unlockindex($group_key);
 		}
 
@@ -458,7 +457,7 @@ public function gc()
 					}
 				}
 
-				static::$_db->replace($index2key, $index2, 0, 0);
+				static::$_db->set($index2key, $index2, 0, 0);
 				$total_index2++;
 			}
 
@@ -523,8 +522,6 @@ public function lock($id, $group, $locktime)
 			{
 				if ($lock_counter > $looptime)
 				{
-					$returning->locked = false;
-					$returning->locklooped = true;
 					break;
 				}
 
@@ -535,6 +532,7 @@ public function lock($id, $group, $locktime)
 
 			$returning->locklooped = true;
 		}
+
 		$returning->locked = $data_lock;
 
 		return $returning;