Session and Cookies in PHP

Session & Cookie
session_start() -> will not override previous session
session_start() -> when its call at the same time blank file automatically created
session_destroy() -> To destroy session

Cookies
setcookies() -> Its use to destroy cookies

Flash Cookies
Write file at unknown file location, user will delete the cookies not that folder which located on user system.

Session vs Cookies?

1. session is safer than cookies
2. cookies save in user system while session file save in server
3. Maximum cookie size is 4kb.
4. Session is depends on cookie because it has session id

Session Count JSP Program

<%@ page import="java.io.*,java.util.*" %>
<%
   // Get session creation time.
   Date createTime = new Date(session.getCreationTime());
   // Get last access time of this web page.
   Date lastAccessTime = new Date(session.getLastAccessedTime());

   String title = "Welcome Back to my website";
   Integer visitCount = new Integer(0);
   String visitCountKey = new String("visitCount");
   String userIDKey = new String("userID");
   String userID = new String("ABCD");

   // Check if this is new comer on your web page.
   if (session.isNew()){
      title = "Welcome to my website";
      session.setAttribute(userIDKey, userID);
      session.setAttribute(visitCountKey,  visitCount);
   }
   visitCount = (Integer)session.getAttribute(visitCountKey);
   visitCount = visitCount + 1;
   userID = (String)session.getAttribute(userIDKey);
   session.setAttribute(visitCountKey,  visitCount);
%>
<html>
<head>
<title>Session Tracking</title>
</head>
<body>
<h1>Session Tracking</h1>
<table border="1" align="center">
<tr bgcolor="#949494">
   <th>Session info</th>
   <th>Value</th>
</tr>
<tr>
   <td>id</td>
   <td><% out.print( session.getId()); %></td>
</tr>
<tr>
   <td>Creation Time</td>
   <td><% out.print(createTime); %></td>
</tr>
<tr>
   <td>Time of Last Access</td>
   <td><% out.print(lastAccessTime); %></td>
</tr>
<tr>
   <td>User ID</td>
   <td><% out.print(userID); %></td>
</tr>
<tr>
   <td>Number of visits</td>
   <td><% out.print(visitCount); %></td>
</tr>
</table>
</body>
</html>