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Php sessions & cookies

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PHP SESSIONS

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Php sessions & cookies

  1. 1. WELCOME
  2. 2. INTRODUCTION TO PHP SESSIONS AND COOKIES
  3. 3. What you Benefit ??? By the end of this session you will learn ● How to use Sessions and Cookies to maintain the state among multiple requests.
  4. 4. TASK OF THE DAY Create a session when a user log in to his account. When user logout from his account the session should expire LOGIN PAGE
  5. 5. INTRODUCTION TO PHP SESSIONS AND COOKIES
  6. 6. Introduction To PHP Sessions And Cookies We had already tried passing data to a server . But..how the server knows the user from which the requests are received…?
  7. 7. COOKIES
  8. 8. Cookies •HTTP is a stateless protocol; this means that the web server does not know (or care) whether two requests comes from the same user or not; it just handles each request without regard to the context in which it happens. •Cookies are used to maintain the state in between requests—even when they occur at large time intervals from each other. •Cookies allow your applications to store a small amount of textual data (typically,4-6kB) on a Web client browser. •There are a number of possible uses for cookies, although their most common one is maintaining state of a user
  9. 9. Creating A Cookie • setcookie(“userid", "100", time() + 86400); • This simply sets a cookie variable named “userid” with value “100” and this variable value will be available till next 86400 seconds from current time Cookie variable name variable value Expiration time.
  10. 10. Accessing a Cookie • echo $_COOKIE[’userid’]; // prints 100 • Cookie as array – setcookie("test_cookie[0]", "foo"); – setcookie("test_cookie[1]", "bar"); – setcookie("test_cookie[2]", "bar"); – var_dump($_COOKIE[‘test_cookie’]);
  11. 11. Destroying A Cookie •There is no special methods to destroy a cookie, We achieve it by setting the cookie time into a past time so that it destroys it – Eg : setcookie(‘userid’,100,time()-100);
  12. 12. SESSIONS
  13. 13. Sessions •Session serve the same purpose of cookies that is sessions are used to maintain the state in between requests •Session can be started in two ways in PHP – By changing the session.auto_start configuration setting in php.ini – Calling session_start() on the beginning of each pages wherever you use session(Most common way) Note: session_start() must be called before any output is sent to the browser
  14. 14. Creating and accessing session • Once session is started you can create and access session variables like any other arrays in PHP – $_SESSION[‘userid’] = 100; – echo $_SESSION[‘userid’]; //prints 100 Session variable name variable value
  15. 15. Destroying A Session •There are two methods to destroy a session variable 1. Using unset() function • Eg unset($_SESSION[‘userid’]) 1. Calling session_destroy() method. This will effectively destroy all the session variables. So for deleting only one variable you should go for the previous method • Session_destroy()
  16. 16. Let’s try implementing with our task
  17. 17. Step 1 Goto Login_baabtra.php page and set form action to Profile.php page <form name=”login” action=”login_action.php” method=”post”>
  18. 18. Step 2 Login_action.php Page Create database connection here mysql_connect('localhost','root',''); mysql_select_db("Baabtra"); $result=mysql_query("select * from tbl_user where vchr_user_name='$username'and vchr_password='$password'");
  19. 19. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } checks whether there is any resultant
  20. 20. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } starts a session
  21. 21. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } sets a session variable userid with value of pk_int_user_id field of the resultant set
  22. 22. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } sets a session variable userid with value of pk_int_user_id field of the resultant set
  23. 23. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } sets a session variable userid with value of pk_int_user_id field of the resultant set
  24. 24. Step 3 Login_action.php Page Check whether id is valid or not.if valid user then create session if(mysql_num_rows($result)){ while($row=mysql_fetch_array($result)){ session_start(); $_SESSION['user_id']=$row['pk_int_user_id']; header(‘Location: profile.php’); } } header function is used for page redirection
  25. 25. Step 4 Design a profile Page and Create a link for Logout
  26. 26. Step 5 Go to profile page and display Qualification details of that particular user using session variable.
  27. 27. Step 5 Profile.php session_start(); $user_id=$_SESSION['user_id']; mysql_connect('localhost','root',''); mysql_select_db("Baabtra"); $result=mysql_query("select * from tbl_academic_qualificaion where fk_int_user_id='$user_id'"); echo “ qualification name-----college--------percentage--------passout”; while($data=mysql_fetch_assoc($result)){ echo $data['vchr_qualification_name']; echo $data['vchr_qualification_name']; echo $data['int_percentage']; echo $data['dat_passout_date']; }
  28. 28. Step 5 Profile.php session_start(); $user_id=$_SESSION['user_id']; mysql_connect('localhost','root',''); mysql_select_db("Baabtra"); $result=mysql_query("select * from tbl_academic_qualificaion where fk_int_user_id='$user_id'"); echo “ qualification name-----college--------percentage--------passout”; while($data=mysql_fetch_assoc($result)){ echo $data['vchr_qualification_name']; echo $data['vchr_qualification_name']; echo $data['int_percentage']; echo $data['dat_passout_date']; } fetches the session variable user_id and stores to variable $userid
  29. 29. Step 5 Profile.php session_start(); $user_id=$_SESSION['user_id']; mysql_connect('localhost','root',''); mysql_select_db("Baabtra"); $result=mysql_query("select * from tbl_academic_qualificaion where fk_int_user_id='$user_id'"); echo “ qualification name-----college--------percentage--------passout”; while($data=mysql_fetch_assoc($result)){ echo $data['vchr_qualification_name']; echo $data['vchr_qualification_name']; echo $data['int_percentage']; echo $data['dat_passout_date']; } selects the qualification details of the user that matches with session value
  30. 30. Step 6 Destroy session on Logout
  31. 31. Step 6 Logout.php unset($_SESSION[‘user_id’]); header(‘Location: Login_baabtra.php’);
  32. 32. Comparison Cookies are stored in the user's browser A cookie can keep information in the user's browser until deleted by user or set as per the timer. It will not be destroyed even if you close the browser. Cookies can only store string We can save cookie for future reference Sessions are stored in server A session is available as long as the browser is opened. User cant disable the session. It will be destroyed if you close the browser Can store not only strings but also objects session cant be. Cookies Session
  33. 33. END OF THE SESSION

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