QR code which means quick response is the trademark for a type of matrix barcode or two-dimensional barcode. A barcode is a machine-readable optical label that contains information about the item to which it is attached. A QR code consists of black modules arranged in a square pattern on a white background. The information encoded can be text, URL or other data. The QR codes are unique and can't be read by humans, but can be read by special QR code readers and mobile phones with cameras.

QR code is a two-dimensional code. It is a machine-readable pattern of black and white squares, typically used for storing URLs or other information for reading by the camera on a smartphone.

 These codes are created from blocks of black modules arranged in a square pattern on a white background and are read by an imaging device such as a camera having an embedded smart chip that can decipher the contents of each of these modules.

USES OF QR CODES

1. QR Codes are used in marketing campaigns as a way of providing instant information about products or services.

2. They are used in many different situations to provide information, such as product tracking.

3. It is also used in accessing the internet, or just storing contact information. 

4. The codes are also used to share links on social media sites like Facebook or Twitter.

5. It is also used for storing information about items, such as product identification, routing information and more.

HOW TO GENERATE QR CODE IN PHP

Here are few ways by which you can generate QR code in PHP:

1. Use Google Chart API

2. Use Zxing library

3. Use PHP QR Code Generator

4. You can use the PHP QR Code library. This is the most popular library for generating QR Codes in PHP. It supports generating of QR codes in many different sizes, from 1×1 px up to 300×300 px.

5. You can also use third party APIs like Google GSON to decode and encode data into QR codes.

6. Mobile-friendly URL Shortener for PHP. This is another useful QR Code generator which will help you generate QR codes with ease. You can download this script from here

1. QR Code Generator with jQuery Mobile Framework.It allows you to create and manage multiple QR codes using jQuery Mobile framework.

2. It is mainly used in the mobile payment and advertising industries.

In this article, I have shown you what QR code means and I have also given you some uses of QR codes and how to generate them in PHP.