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vendor/maximebf/debugbar/src/DebugBar/RequestIdGeneratorInterface.php

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+<?php
+/*
+ * This file is part of the DebugBar package.
+ *
+ * (c) 2013 Maxime Bouroumeau-Fuseau
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace DebugBar;
+
+interface RequestIdGeneratorInterface
+{
+    /**
+     * Generates a unique id for the current request.  If called repeatedly, a new unique id must
+     * always be returned on each call to generate() - even across different object instances.
+     *
+     * To avoid any potential confusion in ID --> value maps, the returned value must be
+     * guaranteed to not be all-numeric.
+     *
+     * @return string
+     */
+    function generate();
+}