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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
Usage
Passing headers from a request object
With no arguments, CrawlerDetect reads $_SERVER. If your headers come from somewhere else — a PSR-7 request, Symfony's HeaderBag, Swoole, or a Lambda event — pass them in directly. Both real header names (User-Agent) and PHP's SAPI names (HTTP_USER_AGENT) are understood, and values may be strings or arrays of strings.
Prefer this over isCrawler($request->getHeaderLine('User-Agent')). Some crawlers — Googlebot in particular — send a genuine browser User-Agent and identify themselves in another header such as From or Sec-CH-UA. Passing the full set lets CrawlerDetect check all of them; passing a single string can only ever check one.
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
adds the failing user agent string to tests/data/user_agent/crawlers.txt
The raw/Crawlers.json and raw/Crawlers.txt files are regenerated automatically by export.php after merge — no need to touch them.
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.
Composer command for our command line client (download client)This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free.Standard composer command
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