SESSION IN WEB
PRESENTED BY,
MD RAHEDUL ISLAM
ID:180107
WHAT IS SESSION
• The amount of time that a user spends engaged in a particular activity.
• Way to store information (in variables) to be used across multiple pages.
• The moment they arrive on the first page, to the moment they leave the site.
WHY DO WE USE IT?
• HTTP is StateLess.
• Application would not be able to remember user-specific information .
• Keep track of information .
• To store important information securely (id,password).
• Authentication , Form submission(multipage) , Shopping cart contents .
• The user navigates between different pages of the application .
HOW DOES IT WORK
SESSION VARIABLES
$_SESSION[‘UserName’]=‘Rupok’;
$_SESSION[‘Password’]=‘1234’;
$_SESSION[‘time’]=time();
$_SESSION[‘cart’]=“$number”;
SESSION VS COOKIE
SESSION
COOKIE
• Server-side files
• Client-side files
• Ends when a user closes his browser
• Depending on the lifetime you set
• Dependent on Cookie
• Cookie is not dependent on Session
• Save the user’s data in encrypted form
• Save the user’s data in a text file
DISADVANTAGES
• Server resources(high traffic website).
• Scalability(large number of simultaneous sessions).
• Security risks(Hijacking)
• User experience(Expires unexpectedly).
THANK YOU!
rahedul0176@gmail.com