ext/mysqli: Skip test that needs superuser

This test needs CREATE DATABASE and CREATE SERVER, and will fail in
the cleanup step if it doesn't have it. If the test is running as a
user that can't do these, then we should skip instead of borking.

Alternative to phpGH-17466.

Author: NattyNarwhal

ext/mysqli/tests/mysqli_get_client_stats.phpt

@@ -4,7 +4,33 @@ mysqli_get_client_stats()
 mysqli
 --SKIPIF--
 <?PHP
-require_once 'skipifconnectfailure.inc';
+    require_once __DIR__ . '/test_setup/test_helpers.inc';
+    $link = mysqli_connect_or_skip();
+    // We run some operations that need CREATE SERVER and CREATE DATABASE in
+    // this test, so check if we can do that. We don't check if we can merely
+    // create a table; if that doesn't work with the provided database, many
+    // more tests would fail.
+
+    // It seems DML can be privilege checked on prepare, but DML can't be, so
+    // we need to execute and clean up.
+    try {
+        $sql = "CREATE DATABASE mysqli_get_client_stats";
+        $stmt = mysqli_query($link, $sql);
+        $stmt->close();
+         mysqli_query($link, "DROP DATABASE mysqli_get_client_stats");
+    } catch (\mysqli_sql_exception) {
+        die("skip don't have create database privilege");
+    }
+    try {
+        $sql = sprintf("CREATE SERVER myself FOREIGN DATA WRAPPER mysql OPTIONS (user '%s', password '%s', database '%s')",
+            get_default_user(), get_default_password(), get_default_database());
+        $stmt = mysqli_query($link, $sql);
+        $stmt->close();
+        mysqli_query($link, "DROP SERVER myself");
+    } catch(\mysqli_sql_exception) {
+        die("skip don't have create server privilege");
+    }
+    mysqli_close($link);
 ?>
 --INI--
 mysqlnd.collect_statistics=1