How is php session different from cookie?
What is Cookie?A cookie is a small file with the maximum size of 4KB that the web server stores on the client computer. Once a cookie has been set, all page requests that follow return the cookie name and value. A cookie can only be read from the domain that it has been issued from. For example, a cookie set using the domain www.guru99.com cannot be read from the domain career.guru99.com. Most of the websites on the internet display elements from other domains such as advertising. The domains serving these elements can also set their own cookies. These are known as third party cookies. A cookie created by a user can only be visible to them. Other users cannot see its value. Most web browsers have options for disabling cookies, third party cookies or both. Show
What is a Session?A session is a global variable stored on the server. Each session is assigned a unique id which is used to retrieve stored values. Whenever a session is created, a cookie containing the unique session id is stored on the user’s computer and returned with every request to the server. If the client browser does not support cookies, the unique session id is displayed in the URL. Sessions have the capacity to store relatively large data compared to cookies. The session values are automatically deleted when the browser is closed. If you want to store the values permanently, then you should store them in the database. Just like the $_COOKIE array variable, session variables are stored in the $_SESSION array variable. Just like cookies, the session must be started before any HTML tags.
Why and when to use Cookies?Http is a stateless protocol; cookies allow us to track the state of the application using small files stored on the user’s computer. The path were the cookies are stored depends on the browser. Internet Explorer usually stores them in Temporal Internet Files folder. Personalizing the user experience – this is achieved by allowing users to select their preferences. The page requested that follow are personalized based on the set preferences in the cookies. Tracking the pages visited by a user. Why and when to use Sessions?To store important information such as the user id more securely on the server where malicious users cannot temper with them. Sessions are used to pass values from one page to another. It is also used when you want the alternative to cookies on browsers that do not support cookies, to store global variables in an efficient and more secure way compared to passing them in the URL, developing an application such as a shopping cart that has to temporary store information with a capacity larger than 4KB. Cookie Vs. Session
What is Cookie?A cookie is a small file with the maximum size of 4KB that the web server stores on the client computer. Once a cookie has been set, all page requests that follow return the cookie name and value. A cookie can only be read from the domain that it has been issued from. For example, a cookie set using the domain www.guru99.com can not be read from the domain career.guru99.com. Most of the websites on the internet display elements from other domains such as advertising. The domains serving these elements can also set their own cookies. These are known as third party cookies. A cookie created by a user can only be visible to them. Other users cannot see its value. Most web browsers have options for disabling cookies, third party cookies or both. If this is the case then PHP responds by passing the cookie token in the URL. The diagram shown below illustrates how cookies work.
Here, 1) A user requests for a page that stores cookies 2) The server sets the cookie on the user’s computer 3) Other page requests from the user will return the cookie name and value In this tutorial, you will learn-
Why and when to use Cookies?
Creating CookiesLet’s now look at the basic syntax used to create a cookie. ihoctot.com, [secure], [httponly]); ?> HERE,
Note: the php set cookie function must be executed before the HTML opening tag. Let’s now look at an example that uses cookies. We will create a basic program that allows us to store the user name in a cookie that expires after ten seconds. The code below shows the implementation of the above example “cookies.php”. Output: the cookie has been set for 60 seconds Retrieving the Cookie valueCreate another file named “cookies_read.php” with the following code. Output: Array ( [PHPSESSID] => h5onbf7pctbr0t68adugdp2611 [user_name] => Guru99 ) Note: $_COOKIE is a PHP built in super global variable. It contains the names and values of all the set cookies. The number of values that the $_COOKIE array can contain depends on the memory size set in php.ini. The default value is 1GB. Testing our application. Let’s assume you have saved your PHP files in phptus folder.
Note: Only an empty array has been displayed
Wait for a minute then click on refresh button again. What results did you get? Delete Cookies
What is a Session?
Why and when to use Sessions?
Creating a SessionIn order to create a session, you must first call the PHP session_start function and then store your values in the $_SESSION array variable. Let’s suppose we want to know the number of times that a page has been loaded, we can use a session to do that. The code below shows how to create and retrieve values from sessions Output: You are visitor number 1 Destroying Session VariablesThe session_destroy() function is used to destroy the whole Php session variables. If you want to destroy only a session single item, you use the unset() function. The code below illustrates how to use both methods. Session_destroy removes all the session data including cookies associated with the session. Unset only frees the individual session variables. Other data remains intact. Summary
Is PHP session a cookie?PHP Sessions
Sessions are an alternative to cookies. A session is usually a file or database record on the server side which contains the small pieces of data which the server wants to store for each user.
What is the difference between session and cookie explain with example?Cookies are client-side files on a local computer that hold user information. Sessions are server-side files that contain user data. Cookies end on the lifetime set by the user. When the user quits the browser or logs out of the programmed, the session is over.
What is the difference between a cookie and a session variable?A session stores the variables and their values within a file in a temporary directory on the server. Cookies are stored on the user's computer as a text file. The session ends when the user logout from the application or closes his web browser. Cookies end on the lifetime set by the user.
How does PHP session work without browser cookies?You can also login without Cookies only by Session Id and Time, but you have to write them both in your Database direct after Successful Login. I have in index. php something like this that will always generate a new session id based on time and the old session id if conditions are not verified.
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