PHP Sessions

What is a Session ??

A Session is a process of inter-related actions between  a  client  and a  web server. Session variables manages the memory of the browser when you exit a one page and go to another. 

How do we make the Browser remember a certain unit of data while we navigatefrom page to page?
 Simply, assign that data to a “session variable”, using thefollowing format - 
$_SESSION[“ << some unique name >> ”].

eg. :- $_SESSION[“employeeName”] = “Nimal”,

$_SESSION[“employeeID”] = EMP0589

• employeeName and employeeID are  uniquely identify a variable.

•Another method is, to use the predefined function session_register(“ “)

jQuery

jQuery  ?

It is a free open source javaScript library that simplifies the task of creating highly responsive web pages. 

Benifits of jQuery

• jQuery is extensible. 
• Works with sets of elements. 
• Performs multiple operations on a set of elements with one line of code.  (Statement chaining)
• Hides various browser quirks. 

jQuery Features

• Core functionaliy 
• Implements core jquery functions as well as commonly used utilities.
• Manipulation and CSS
• Functions for editing and changing document content and working with CSS data such as positioning.
• AJAX
• Utilities for working with AJAX, such as loading content from pages and dealing with JSON data.
• Events
• Simplifies working with DOM (Document Object Model) events and provides common event helper functions. 
• Effects 
• Functions for creating basic animations and effects such as hiding and showing elements and moving objects around. 
• Selection and Traversal 
• Functions for finding content in documents & navigating among the contents of the document. 

Download jQuery 

Download from this link https://jquery.com/

There are two versions

1. Compressed production version - Useful when upload the completed project to the web server as it is compressed (minified) and less weight.
2. Uncompressed development jQuery - Useful when development process happens of the project.