--- /dev/null
+--TEST--
+Check function with optional arguments.
+--FILE--
+<?php
+
+// See comment in php/run-php-tests.sh.
+//putenv ('LIBGUESTFS_DEBUG=1');
+
+$g = guestfs_create ();
+if ($g == false) {
+ echo ("Failed to create guestfs_php handle.\n");
+ exit;
+}
+if (guestfs_add_drive_opts ($g, "/dev/null") == false) {
+ echo ("Failed add_drive_opts, no optional arguments.\n");
+ exit;
+}
+if (guestfs_add_drive_opts ($g, "/dev/null", 0) == false) {
+ echo ("Failed add_drive_opts, one optional argument.\n");
+ exit;
+}
+if (guestfs_add_drive_opts ($g, "/dev/null", 1) == false) {
+ echo ("Failed add_drive_opts, one optional argument.\n");
+ exit;
+}
+if (guestfs_add_drive_opts ($g, "/dev/null", 1, "qcow2") == false) {
+ echo ("Failed add_drive_opts, two optional arguments.\n");
+ exit;
+}
+echo ("Completed tests OK.\n");
+?>
+--EXPECT--
+Completed tests OK.