What is PHP session and how it works?

In PHP, a session provides a way to store web page visitor preferences on a web server in the form of variables that can be used across multiple pages. … The information is retrieved from the web server when a session is opened at the beginning of each web page. The session expires when the web page is closed.

What is PHP session how session is created and destroyed?

A PHP session can be destroyed by session_destroy() function. This function does not need any argument and a single call can destroy all the session variables. If you want to destroy a single session variable then you can use unset() function to unset a session variable.

Why do we need session in PHP?

PHP session is used to store and pass information from one page to another temporarily (until user close the website). PHP session technique is widely used in shopping websites where we need to store and pass cart information e.g. username, product code, product name, product price etc from one page to another.

INTERESTING:  What are the basic steps to connect python with MySQL using Table members present in the database?

How do I start a PHP session?

To begin a new session, simply call the PHP session_start() function. It will create a new session and generate a unique session ID for the user. The PHP code in the example below simply starts a new session.

How is PHP session data stored?

PHP Default Session Storage (File System): In PHP, by default session data is stored in files on the server. Each file is named after a cookie that is stored on the client computer. This session cookie (PHPSESSID) presumably survives on the client side until all windows of the browser are closed.

What is cookie and session in PHP?

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.

What is difference between cookies and session?

The main difference between a session and a cookie is that session data is stored on the server, whereas cookies store data in the visitor’s browser. Sessions are more secure than cookies as it is stored in server. Cookie can be turned off from browser.

Why are sessions used?

Sessions are a simple way to store data for individual users against a unique session ID. … Session IDs are normally sent to the browser via session cookies and the ID is used to retrieve existing session data. The absence of an ID or session cookie lets PHP know to create a new session, and generate a new session ID.

INTERESTING:  What is JavaScript and is it safe?

What is session with example?

An example of a session is jury members meeting to agree on a verdict. An example of a session is the time when students are attending classes at school. … The number of hours within a day that a given body is performing its duties; a meeting of a court or a legislative body for the purpose of performing its business.

Why sessions are needed?

It allows the server to manage session state; e.g. if a user suspects somebody is logged in as them on another device, they can invalidate all other sessions (“log me out everywhere” functionality). You may be storing a lot of data, and sending it back and forth in a cookie on every request can become rather wasteful.

What is session management PHP?

A session is a way to store information (in variables) to be used across multiple pages. Unlike a cookie, the information is not stored on the users computer.

What is PHP session ID?

Sessions and PHP

PHP allows us to track each visitor via a unique session ID which can be used to correlate data between connections. This id is a random string sent to the user when a session is created and is stored within the user’s browser in a cookie (by default called PHPSESSID).

Where must session start appear in PHP?

Discussion Forum

Que. The session_start() function must appear..
b. after the body tag
c. before the body tag
d. before the html tag
Answer:before the html tag

Where does PHP store sessions?

PHP Session Start

By default, session data is stored in the server’s /tmp directory in files that are named sess_ followed by a unique alphanumeric string (the session identifier).

INTERESTING:  Which is best MySQL or PostgreSQL?

What do you mean by session?

1 : a meeting or period devoted to a particular activity The football team held a practice session. 2 : a single meeting (as of a court, lawmaking body, or school) 3 : a whole series of meetings Congress was in session for six months.

What is the default PHP session name?

Discussion Forum

Que. Which one of the following is the default PHP session name?