44 lines
1.5 KiB
PHP
44 lines
1.5 KiB
PHP
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<?php
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/*
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* This file is part of the DebugBar package.
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*
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* (c) 2013 Maxime Bouroumeau-Fuseau
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace DebugBar;
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/**
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* Basic request ID generator
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*/
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class RequestIdGenerator implements RequestIdGeneratorInterface
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{
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protected $index = 0;
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/**
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* @return string
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*/
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public function generate()
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{
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if (function_exists('random_bytes')) {
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// PHP 7 only
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return 'X' . bin2hex(random_bytes(16));
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} else if (function_exists('openssl_random_pseudo_bytes')) {
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// PHP >= 5.3.0, but OpenSSL may not always be available
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return 'X' . bin2hex(openssl_random_pseudo_bytes(16));
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} else {
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// Fall back to a rudimentary ID generator:
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// * $_SERVER array will make the ID unique to this request.
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// * spl_object_hash($this) will make the ID unique to this object instance.
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// (note that object hashes can be reused, but the other data here should prevent issues here).
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// * uniqid('', true) will use the current microtime(), plus additional random data.
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// * $this->index guarantees the uniqueness of IDs from the current object.
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$this->index++;
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$entropy = serialize($_SERVER) . uniqid('', true) . spl_object_hash($this) . $this->index;
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return 'X' . md5($entropy);
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}
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}
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}
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