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diff --git a/www/wiki/includes/libs/Xhprof.php b/www/wiki/includes/libs/Xhprof.php
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+++ b/www/wiki/includes/libs/Xhprof.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * Convenience class for working with XHProf
+ * <https://github.com/phacility/xhprof>. XHProf can be installed as a PECL
+ * package for use with PHP5 (Zend PHP) and is built-in to HHVM 3.3.0.
+ *
+ * This also supports using the Tideways profiler
+ * <https://github.com/tideways/php-profiler-extension>, which additionally
+ * has support for PHP7.
+ *
+ * @since 1.28
+ */
+class Xhprof {
+	/**
+	 * @var bool $enabled Whether XHProf is currently running.
+	 */
+	protected static $enabled;
+
+	/**
+	 * Start xhprof profiler
+	 * @return bool
+	 */
+	public static function isEnabled() {
+		return self::$enabled;
+	}
+
+	/**
+	 * Start xhprof profiler
+	 * @param int $flags
+	 * @param array $options
+	 * @throws Exception
+	 */
+	public static function enable( $flags = 0, $options = [] ) {
+		if ( self::isEnabled() ) {
+			throw new Exception( 'Profiling is already enabled.' );
+		}
+		self::$enabled = true;
+		if ( function_exists( 'xhprof_enable' ) ) {
+			xhprof_enable( $flags, $options );
+		} elseif ( function_exists( 'tideways_enable' ) ) {
+			tideways_enable( $flags, $options );
+		} else {
+			throw new Exception( "Neither xhprof nor tideways are installed" );
+		}
+	}
+
+	/**
+	 * Stop xhprof profiler
+	 *
+	 * @return array|null xhprof data from the run, or null if xhprof was not running.
+	 */
+	public static function disable() {
+		if ( self::isEnabled() ) {
+			self::$enabled = false;
+			if ( function_exists( 'xhprof_disable' ) ) {
+				return xhprof_disable();
+			} else {
+				// tideways
+				return tideways_disable();
+			}
+		}
+	}
+}