UidProcessor.php

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<?php

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Processor;

class UidProcessor
{
    private $uid;

    public function __construct($length = 7)
    {
        if (!is_int($length) || $length > 32 || $length < 1) {
            throw new \InvalidArgumentException('The uid length must be an integer between 1 and 32');
        }

        $this->uid = substr(hash('md5', uniqid('', true)), 0, $length);
    }

    public function __invoke(array $record)
    {
        $record['extra']['uid'] = $this->uid;

        return $record;
    }
}