What are cookies in php?

Cookie is under the HTTP protocol, through the server or Scripting language is a way to maintain information on the customer's browser. The use of cookies is very common. Many websites that provide personalized services use cookies to distinguish between different users, such as Web. The free E-mail website that interfaces requires the use of cookies. Effective use of cookies can easily complete many complex tasks.

Understand Cookies

First of all, let’s briefly introduce what Cookie is and what Cookie can do. Let friends have a clearer understanding and sensory concept of Cookie.

1. What is Cookie##.

#Cookie is a mechanism that stores data on the client's browser to track and identify the user. Simply put, a cookie is a text file that is temporarily stored on the user's hard drive by the Web server and subsequently Read by the web browser. When the user visits the web site again, the website records the user's specific information (such as the location of the last visit, time spent, user name and password, etc.) by reading the cookie file, thereby quickly Respond accordingly. For example, you can directly log in to the website without entering the user's ID and password, etc. The command format of the cookie text file is as follows:

Username@Website address. [Number].txt

For a simple example, if the user's system disk is C drive and the operating system is Windows, when using a browser to access a Web website, the Web server will automatically generate it in the above command format. The response Cookie text file is stored in the location specified by the user's hard disk.

What needs to be noted here is: In the Cookie folder, each Cookie file is a simple and ordinary text file, not Program.

Most of the content in the cookie file is encrypted, so it appears to be just a combination of letters and numbers, and only the server's CGI handler knows their true meaning ##.

#2. Where do cookies generally reside?

The essence of a cookie is a small piece of data, a small piece of data stored on your computer’s hard drive. But where does it exist? The storage path may be different in different browsers. The storage path of the Chrome browser's cookie file is:

C:\Users\your username\AppData\Local\Google \Chrome\User Data\Default\Cookies

The cookie file storage path of Firefox browser is:

C:\Users\your username\AppData\Roaming\Mozilla\Firefox\Profiles \xxx.default\cookies.sqlite Everyone may be slightly different

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