Replace array_key_exists() with isset() and ! empty()
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index 9fce186..700cde4 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -255,7 +255,7 @@
 		{
 			$sql .= $param['name'].',';
 
-			if (array_key_exists('type', $param) && ($param['type'] === OCI_B_CURSOR))
+			if (isset($param['type']) && $param['type'] === OCI_B_CURSOR)
 			{
 				$have_cursor = TRUE;
 			}