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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);
}
}
}