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vendor/maximebf/debugbar/src/DebugBar/RequestIdGenerator.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;
+
+/**
+ * Basic request ID generator
+ */
+class RequestIdGenerator implements RequestIdGeneratorInterface
+{
+    protected $index = 0;
+
+    /**
+     * @return string
+     */
+    public function generate()
+    {
+        if (function_exists('random_bytes')) {
+            // PHP 7 only
+            return 'X' . bin2hex(random_bytes(16));
+        } else if (function_exists('openssl_random_pseudo_bytes')) {
+            // PHP >= 5.3.0, but OpenSSL may not always be available
+            return 'X' . bin2hex(openssl_random_pseudo_bytes(16));
+        } else {
+            // Fall back to a rudimentary ID generator:
+            //  * $_SERVER array will make the ID unique to this request.
+            //  * spl_object_hash($this) will make the ID unique to this object instance.
+            //    (note that object hashes can be reused, but the other data here should prevent issues here).
+            //  * uniqid('', true) will use the current microtime(), plus additional random data.
+            //  * $this->index guarantees the uniqueness of IDs from the current object.
+            $this->index++;
+            $entropy = serialize($_SERVER) . uniqid('', true) . spl_object_hash($this) . $this->index;
+            return 'X' . md5($entropy);
+        }
+    }
+}