PHP Variables
PHP Data Types
PHP Echo & Print
PHP Strings
PHP Numbers
PHP Constants
PHP Operators
PHP if...else...elseif Statements
Switch Statement
PHP Loops
PHP Arrays
Superglobals
PHP Coding Standards
PHP Form Handling
PHP Form Validation
PHP URLs Validation
PHP Form Required Validation
Complete Form Example
PHP File Functions Open/Read
PHP File Create/Write
PHP File Upload
PHP Cookies Handling
PHP Session Handling
PHP filter_var() Function
PHP Validation Filters
PHP Sanitization Filters
Using Filters
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JSON
PHP Date and Time
MySQL Database
MySQL Connect
MySQL Commands-Creating a Table
MySQL Commands-Inserting The data
MySQL Commands-Prepared Statement
MySQL Commands-Selecting The Data
MySQL Commands-Where and Order By
MySQL Commands-Deleting And Updating The Data
PHP-OOP Introduction
PHP-Classes/Objects
PHP-Constructor/Destructor
PHP-Access Modifiers
PHP-Inheritance
PHP-Inheritance and Protected Access Modifier
PHP-Overriding Inherited Methods
PHP-Final keyword
PHP-Abstract Classes
PHP-Constants
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PHP-Static Methods and Properties
Introduction to Functions
Defining A function
Returning Values From A Function
Dynamic Function Calls
Variable Scope
Understanding Arguments Or Parameters
Testing For A Function Existence
Returning Multiple Values From A Function
Making practical Use By Building Code Libraries For Code Re-usability
Using Include() And Require()
Session is a way to store the information to navigate to multiple pages and the variables last till a user closes the browser. For example, When you login to any social account or your email you use it by reading mails, sending email, changing personal details etc. When you log out your account after you use it, the time between you login and logout is a session.
Session variable works on all the pages linked to your social account. Example, your name gets displayed on the corner in your email even if you change the page, the name displays on every webpage. When you log out, the name will also not be shown.
1 Starting a Session
In PHP, you can start a session using session_start() function and the variables are set using $_SESSION global variable. You need to use session_start() function on all the pages where you want to start the session.
For example;
session_start();
$_SESSION[“username”]= “Ben”;
echo “Session”. $_SESSION[“username”]. “is started”;
?>
2 PHP Session Variable Values
You can set session variable values as we have seen in the above example like an array. We have started the session and set the value in one webpage, but we can retrieve the value of the current session in another webpage also. For example, if we create another php file and write the below code, we can access the value set on the above page.
session_start();
?>
echo “ The username for current session is” . $_SESSION[“username”];
?>
Output of the above php code will be: The username for current session is: Ben
3 Modify a Session Variable
You can modify or update a session variable simply by overwriting it. You can change the value of the $_SESSION variable as below:
session_start();
?.
$SESSION [“username”] = “Paul”;
echo “ The updated username is :”.$_SESSION[“username”];
?>
The output of above php code will be: The updated username is: Paul
4 Destroy a Session
You can destroy a php session using session_unset() and session_destroy() functions. session_unset() function removes or delete all the session variables and session_destroy() function destroys the session.
For example:
session_start();
?>
session_unset();
session_destroy();
?>
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