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




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About CrawlerDetect

CrawlerDetect is a PHP class for detecting bots/crawlers/spiders via the user agent and http_from header. Currently able to detect 1,000's of bots/spiders/crawlers.


Run composer require jaybizzle/crawler-detect 1.* or add "jaybizzle/crawler-detect" :"1.*" to your composer.json.


use Jaybizzle\CrawlerDetect\CrawlerDetect;

$CrawlerDetect = new CrawlerDetect;

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

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


If you find a bot/spider/crawler user agent that CrawlerDetect fails to detect, please submit a pull request with the regex pattern added to the $data array in Fixtures/Crawlers.php and add the failing user agent to tests/crawlers.txt.

Failing that, just create an issue with the user agent you have found, and we'll take it from there :)

Laravel Package

If you would like to use this with Laravel 4/5, please see Laravel-Crawler-Detect

Symfony Bundle

To use this library with Symfony 2/3/4, check out the CrawlerDetectBundle.

YII2 Extension

To use this library with the YII2 framework, check out yii2-crawler-detect.

ES6 Library

To use this library with NodeJS or any ES6 application based, check out es6-crawler-detect.

.NET Library

To use this library in a .net standard (including .net core) based project, check out NetCrawlerDetect.

Nette Extension

To use this library with the Nette framework, checkout NetteCrawlerDetect.

Ruby Gem

To use this library with Ruby on Rails or any Ruby-based application, check out crawler_detect gem.

Parts of this class are based on the brilliant MobileDetect