I deployed CodeIgniter 4.6.0 but I'm getting syntax errors in Config/App.php, specifically with the public string baseURL declaration. When I remove the type declaration, the error just moves to the next line. I'm also seeing similar syntax issues in other files like Routes.php. How can I properly install and configure CodeIgniter 4.6.0 to avoid these 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.

To generate multiple barcodes in CodeIgniter, you can loop through your barcode generation code, providing the required data for each barcode, and generate multiple barcodes accordingly.

You can generate barcodes in CodeIgniter by using Zend library, follow the steps given below to generate:

• Firstly, generate a random number
• Then, load zend library
• By using factory method create instance of renderer
• Fill the necessary details required like barcode format, name, etc
• Press Enter
• Then, store the image in the barcode folder
• Load the image and use it

To implement a web application firewall you should:

• Choose a WAF type like Cloud-based, application-based or open-source.
• Place the WAF between users and your web app.
• Enable default protection, then add custom rules for your app.
• Start in monitor mode.
• Switch to block mode.
• Monitor and update.

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