diff --git a/classes/db_pdo.php b/classes/db_pdo.php
index 6175836..74645d4 100644
--- a/classes/db_pdo.php
+++ b/classes/db_pdo.php
@@ -166,11 +166,8 @@ abstract class DB_PDO extends PDO {
 		$idents = (array) explode('.', $table);
 		$segments = count($idents);
 
-		// Reference the last item in the split string
-		$last =& $idents[$segments - 1];
-
 	    // Quote the last item
-	    $last = $this->_prefix($last);
+	    $idents[$segments - 1] = $this->_prefix(end($idents));
 
 	    // Rejoin
 	    $table = implode('.', $idents);
@@ -481,7 +478,6 @@ abstract class DB_PDO extends PDO {
 
 		$table = $this->quote_table($table);
 		$fields = array_keys($data[0]);
-		$vals = array();
 
 		$sql = "INSERT INTO {$table} (";
 		$sql .= implode(',', $this->quote_ident($fields));
diff --git a/drivers/mysql/mysql_util.php b/drivers/mysql/mysql_util.php
index c158558..9835278 100644
--- a/drivers/mysql/mysql_util.php
+++ b/drivers/mysql/mysql_util.php
@@ -19,7 +19,7 @@
  * @package Query
  * @subpackage Drivers
  * @method array get_dbs()
- * @method mixed driver_query(string $sql, bool $filtered_index)
+ * @method mixed driver_query(string $sql, bool $filtered_index=TRUE)
  * @method array get_system_tables()
  * @method array get_tables()
  * @method mixed query(string $sql)