What is the function of web application firewalls?

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.

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