How to Integrate Shieldon WAF with a PHP Framework for Better App Security

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A Web Application Firewall (WAF) operates at the application layer of the OSI model, acting as a security barrier between HTTP requests and a web server to block threats like SQL injection, XSS, and cross-site forgery. WAFs function through allow-list and block-list policies that filter incoming traffic based on predefined rules. They come in three deployment types — host-based, network-based, and cloud-based — each with distinct trade-offs in cost, complexity, and customization. Shieldon is an open-source PHP-based WAF that detects and blocks suspicious activity, often using CAPTCHA challenges for verification. The integration guide walks developers through setting up Shieldon on a Slim PHP application using Composer and MySQL, and configuring it via the Shieldon control panel.

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