installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/Util_Bus.php

@@ -0,0 +1,27 @@
+<?php
+namespace W3TC;
+
+class Util_Bus {
+	/**
+	 * Add W3TC action callback
+	 *
+	 * @param string  $key
+	 * @param mixed   $callback
+	 * @return void
+	 */
+	static public function add_ob_callback( $key, $callback ) {
+		$GLOBALS['_w3tc_ob_callbacks'][$key] = $callback;
+	}
+
+	static public function do_ob_callbacks( $order, $value ) {
+		foreach ( $order as $key ) {
+			if ( isset( $GLOBALS['_w3tc_ob_callbacks'][$key] ) ) {
+				$callback = $GLOBALS['_w3tc_ob_callbacks'][$key];
+				if ( is_callable( $callback ) ) {
+					$value = call_user_func( $callback, $value );
+				}
+			}
+		}
+		return $value;
+	}
+}