jaybizzle/crawler-detect

CrawlerDetect is a PHP class for detecting bots/crawlers/spiders via the user agent

v1.3.9 2026-04-14 19:32 UTC

Requires

• php: >=7.1.0

Requires (Dev)

• phpunit/phpunit: ^4.8|^5.5|^6.5|^7.5|^8.5.52|^9.4

MIT

• Mark Beech

• crawler
• crawler detect
• crawler detector
• php crawler detect
• crawlerdetect

README

crawlerdetect.io

About

CrawlerDetect is a PHP library for detecting bots, crawlers and spiders via the User-Agent and HTTP_FROM headers. It currently recognises thousands of user agents and is updated regularly.

Installation

composer require jaybizzle/crawler-detect

Usage

use Jaybizzle\CrawlerDetect\CrawlerDetect;

$CrawlerDetect = new CrawlerDetect;

// Check the user agent of the current visitor
if ($CrawlerDetect->isCrawler()) {
    // true if a crawler user agent was detected
}

// Pass a user agent as a string
if ($CrawlerDetect->isCrawler('Mozilla/5.0 (compatible; Sosospider/2.0; +http://help.soso.com/webspider.htm)')) {
    // true if a crawler user agent was detected
}

// Output the name of the bot that matched (if any)
echo $CrawlerDetect->getMatches();

Contributing

If you find a bot, spider or crawler that CrawlerDetect fails to detect, please open a pull request that:

• adds the regex pattern to the $data array in src/Fixtures/Crawlers.php and to the raw files raw/Crawlers.json and raw/Crawlers.txt
• adds the failing user agent string to tests/crawlers.txt

If you're not able to submit a PR, open an issue with the user agent string and we'll take it from there.

Ports & Integrations

CrawlerDetect has been ported to a number of other languages and frameworks. If you maintain a port not listed here, please open a PR.

Platform	Project
Laravel	Laravel-Crawler-Detect
Symfony 2 / 3 / 4	CrawlerDetectBundle
Yii2	yii2-crawler-detect
Node.js / ES6	es6-crawler-detect
Python	crawlerdetect
JVM (Java, Scala, Kotlin)	CrawlerDetect
.NET / .NET Core	NetCrawlerDetect
Ruby	crawler_detect
Go	crawlerdetect

Credits

Parts of this library are based on the excellent MobileDetect.

License

Released under the MIT License.