PHP is a widely-used programming language on the web, and it’s estimated that nearly 80% of all websites use it. CrowdSec provides server admins with a PHP bouncer to help ward away bots and bad actors who may attempt to interact with PHP files.
Note that a server agent must be installed, with the bouncer application running at website level. WordPress has a plugin, whilst Drupal does not, but for Drupal you can use the PHP Bouncer directly.
See https://opensource.com/article/22/1/php-website-bouncer-crowdsec
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