diff --git a/apps/user_ldap/group_ldap.php b/apps/user_ldap/group_ldap.php
index 1300a280b0..fb47de7d94 100644
--- a/apps/user_ldap/group_ldap.php
+++ b/apps/user_ldap/group_ldap.php
@@ -88,37 +88,37 @@ class GROUP_LDAP extends BackendUtility implements \OCP\GroupInterface {
 		return $isInGroup;
 	}
 
-	private function _groupMembers($dn_group, &$groups_seen = null) {
-		if ($groups_seen == null) {
-		   $groups_seen = array();
+	private function _groupMembers($dnGroup, &$seen = null) {
+		if ($seen === null) {
+			$seen = array();
 		}
-		$all_members = array();
-		if (array_key_exists($dn_group, $groups_seen)) {
+		$allMembers = array();
+		if (array_key_exists($dnGroup, $seen)) {
 		    // avoid loops
 		    return array();
 		}
 		// used extensively in cron job, caching makes sense for nested groups
-		$cache_key = '_groupMembers'.$dn_group;
-		if($this->access->connection->isCached($cache_key)) {
-			return $this->access->connection->getFromCache($cache_key);
+		$cacheKey = '_groupMembers'.$dnGroup;
+		if($this->access->connection->isCached($cacheKey)) {
+			return $this->access->connection->getFromCache($cacheKey);
 		}
-		$groups_seen[$dn_group] = 1;
-		$members = $this->access->readAttribute($dn_group, $this->access->connection->ldapGroupMemberAssocAttr,
-							$this->access->connection->ldapGroupFilter);
+		$seen[$dnGroup] = 1;
+		$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr,
+												$this->access->connection->ldapGroupFilter);
 		if ($members) {
-  		  foreach ($members as $member_dn) {
-      		    $all_members[$member_dn] = 1;
-		    if ($this->access->connection->ldapNestedGroups) {
- 		      $submembers = $this->_groupMembers($member_dn, $groups_seen);
-		      if ($submembers) {
-		     	$all_members = array_merge($all_members, $submembers);
-		      }
-		    }
-                  }
+			foreach ($members as $memberDN) {
+      		    $allMembers[$memberDN] = 1;
+				if ($this->access->connection->ldapNestedGroups) {
+					$subMembers = $this->_groupMembers($memberDN, $seen);
+					if ($subMembers) {
+						$allMembers = array_merge($allMembers, $subMembers);
+					}
+				}
+			}
 		}
- 		$this->access->connection->writeToCache($cache_key, $all_members);
-		return $all_members;
-    	}
+ 		$this->access->connection->writeToCache($cacheKey, $allMembers);
+		return $allMembers;
+	}
 
 	/**
 	 * @brief Get all groups a user belongs to
@@ -162,11 +162,11 @@ class GROUP_LDAP extends BackendUtility implements \OCP\GroupInterface {
 		return $groups;
 	}
 
-	/* private */ public function _getGroupsByMember($dn, &$seen = null) {
-		if ($seen == null) {
-		   $seen = array();
+	private function _getGroupsByMember($dn, &$seen = null) {
+		if ($seen === null) {
+			$seen = array();
 		}
-		$all_groups = array();
+		$allGroups = array();
 		if (array_key_exists($dn, $seen)) {
 		    // avoid loops
 		    return array();
@@ -177,20 +177,20 @@ class GROUP_LDAP extends BackendUtility implements \OCP\GroupInterface {
 			$this->access->connection->ldapGroupMemberAssocAttr.'='.$dn
 		));
 		$groups = $this->access->fetchListOfGroups($filter,
-			   array($this->access->connection->ldapGroupDisplayName, 'dn'));
-             	if ($groups) {
-   		  foreach ($groups as $groupobj) {
-		    $group_dn = $groupobj['dn'];
-		    $all_groups[$group_dn] = $groupobj;
-		    if ($this->access->connection->ldapNestedGroups) {
-		      $supergroups = $this->_getGroupsByMember($group_dn, $seen);
-		      if ($supergroups) {
-		        $all_groups = array_merge($all_groups, $supergroups);
-		      }
-		    }
-		  }
-               	}
-		return $all_groups;
+			array($this->access->connection->ldapGroupDisplayName, 'dn'));
+		if ($groups) {
+			foreach ($groups as $groupobj) {
+				$groupDN = $groupobj['dn'];
+				$allGroups[$groupDN] = $groupobj;
+				if ($this->access->connection->ldapNestedGroups) {
+					$supergroups = $this->_getGroupsByMember($groupDN, $seen);
+					if ($supergroups) {
+						$allGroups = array_merge($allGroups, $supergroups);
+					}
+				}
+			}
+		}
+		return $allGroups;
 	}
 
 	/**