How to implement a web application firewall?

A web application firewall is a security system that filters, monitors and blocks malicious traffic and attacks to protect your web application and APIs.

A web application firewall (WAF) detects and prevent attacks by analysing incoming and outgoing data, identifying known attack patterns, detecting unusual user activity and automatically denying malicious traffic.

Web application firewalls (WAF) keep websites safe by blocking threats, checking incoming traffic, and creating special rules to help protect each website. WAF also helps follow security requirements like PCI-DSS.

You're likely running CodeIgniter 4.6.0 on PHP version older than 7.4—CI 4.6 requires PHP 7.4 or higher due to features like typed properties (e.g., public string $baseURL). Upgrade your PHP to 7.4, 8.0, or 8.1 to avoid syntax errors.

Programming language of Codelgniter written in is PHP. It is an open-source web framework that allows developers to create a web framework rapidly and efficiently.