custombot.yml

- regex: 'Embedly/0\.\d+'
  name: 'Embedly'
  category: 'Crawler'
  url: 'http://support.embed.ly/'

- regex: 'BrandVerity/1\.0'
  name: 'BrandVerity'
  category: 'Crawler'
  url: 'https://www.brandverity.com/why-is-brandverity-visiting-me'

DeviceDetector.php

<?php
namespace App\Utils;

use DeviceDetector\Parser\Bot;
use DeviceDetector\DeviceDetector as DeviceDetectorBase;

use App\Utils\DeviceDetectorCustomBot;


class DeviceDetector extends DeviceDetectorBase {

    public function __construct($userAgent = '') {
        if ($userAgent != '') {
            $this->setUserAgent($userAgent);
        }

        # Library & Browser at top for small speed-up
        $this->addClientParser('Library');
        $this->addClientParser('Browser');
        $this->addClientParser('MobileApp');
        $this->addClientParser('FeedReader');
        $this->addClientParser('MediaPlayer');
        $this->addClientParser('PIM');

        # not add DeviceParsers

        $this->addBotParser(new Bot());
        $this->addBotParser(new DeviceDetectorCustomBot());
    }

    public function parseBotRunner() {
        return $this->parseBot();
    }

    public function parseClientRunner() {
        return $this->parseClient();
    }
}

DeviceDetectorCustomBot.php

<?php
namespace App\Utils;

use DeviceDetector\Parser\Bot;


class DeviceDetectorCustomBot extends Bot {

    protected $fixtureFile = 'custombot.yml';
    protected $parserName = 'custombot';

    protected function getRegexesDirectory() {
        return __DIR__;
    }
}

test.php

<?php
namespace App\Utils;

use App\Utils\DeviceDetector;
use App\Utils\DeviceDetectorCache;


$dd = new DeviceDetector();

$is_bot = false;

$dd->setUserAgent('python-requests/2.21.0');
$dd->parseBotRunner();

if ($dd->isBot()) {
    $is_bot = true;
} else {
    $dd->parseClientRunner();
    $client = $dd->getClient();
    if ($client['type'] == 'library') {
        $is_bot = true;
    }
}

echo $is_bot;