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Wednesday 1 April 2015

Difference between cookies and sessions in php

Published on: Wednesday, April 01, 2015 by Unknown - 14 comments
Cookies are stored in browser as a text file format.It is stored limit amount of data.It is only allowing 4kb[4096bytes].It is not holding the multiple variable in cookies.

we can accessing the cookies values in easily.So it is less secure.The setcookie() function must appear BEFORE the <html> tag.

 Sessions are stored in server side.It is stored unlimit amount of data.It is holding the multiple variable in sessions. we cannot accessing the cookies values in easily.So it is more secure.

Cookies

Sessions
Cookies are stored in browser as
text file format.

 Sessions are stored in server side.
It is stored limit amount of data.
It is only allowing 4kb[4096bytes]

 It is stored unlimit amount of data.
It is not holding the multiple variable
 in cookies.

 It is holding the multiple variable
 in sessions.
we can accessing the cookies values
in easily.
So it is less secure.
 The setcookie() function must
 appear BEFORE the <html> tag

 we cannot accessing the cookies
values in easily.
So it is more secure.
Destroy Cookies:

  1. if we Closing the browsers at the time
 cookies values destoryed.
 2. setting the cookie time to expire the cookie.

 Destroy Sessions :

  1. using unset() session,we will
destroyed the sessions.
 2. using session_destory(), we we will
destroyed the sessions. 



Example:




<?php
 
  setcookie(name, value, expire, 


path,domain, secure, httponly);






  $cookie_uame = "codingslover";






  $cookie_uvalue= "website";






  //set cookies for 1 hour time
  setcookie($cookie_uname,


$cookie_uvalue, 3600, "/");








  //expire cookies
setcookie($cookie_uname,"",-3600);




?>
   


  




Example:




<?php
    
session_start();

//session variable
$_SESSION['testvaraible'] = 'Codings';
 


//destroyed the entire sessions

session_destroy(); 
       
//Destroyed the session 


variable "testvaraible".
unset($_SESSION['testvaraible']);
?>
   


 









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2. Difference between cookies and sessions in php

3. How to create a .webp image in PHP

4. How to expire PHP session after a period of time

5. How to resolved when Logged out sessions get restored by back button

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Wednesday 25 February 2015


          

        









How to expire PHP session after a period of time








Published on: Wednesday, February 25, 2015 by Unknown - 32 comments























Expire the session after some peiod of time by using in php.





Basically, two methods are available to destory the sessions.



   1. session_destroy()

   2. unset($_SESSION['testvaraible'])

   3. setting the time out for this session













 1.session_destroy()



     if we will call the session_destroy(), it will destroy all the SESSION variable.It is no need any other parameters.






<?php
 session_destroy();
?>





2. unset($_SESSION['testvaraible'])



       When we will call the unset() ,it will destroyed the particular variable.

    Example:

    

      





<?php 
 // Destroyed the session variable "testvaraible".
 unset($_SESSION['testvaraible']);

?>







3. setting the time out for this session







<?php

if isset($_SESSION['LAST_MINITUte_ACTIVITY']) && 
(time() - $_SESSION['LAST_MINITUte_ACTIVITY'] > 1800)) {
    // last request was more than 30 minutes ago

    session_unset();     // unset $_SESSION variable for the run-time
    session_destroy();   // destroy session data in storage
}

// update last activity time stamp
$_SESSION['LAST_MINITUte_ACTIVITY'] = time(); 

/*

You can also use an additional time stamp to regenerate the session ID 
periodically,to avoid attacks on sessions like session fixation:

*/

if (!isset($_SESSION['CREATED'])) {
    $_SESSION['CREATED'] = time();

} else if (time() - $_SESSION['CREATED'] > 1800) {

    // session started more than 30 minutes ago
    // change session ID for the current session
    // an invalidate old session ID
    session_regenerate_id(true);    

    $_SESSION['CREATED'] = time();  // update creation time
}






4.session.gc_maxlifetime()



   By using php ini_set session.gc_maxlifetime also we will expire the session.






<?php
 ini_set session.gc_maxlifetime
?>









  

   



Related Posts:



1. 413 “Request Entity Too Large” error with uploading a file

2. Difference between cookies and sessions in php

3. How to create a .webp image in PHP

4. How to expire PHP session after a period of time

5. How to resolved when Logged out sessions get restored by back button

6. why javascript contains property is not working in chrome browser

7. what are the differences between json and jsonp

8. Abstract Class in Php





















            

          

          

        

Saturday 10 January 2015


          

        









How to describe the single field in table by using mysql?








Published on: Saturday, January 10, 2015 by Unknown - 1 comment






























mysql> desc codingslover;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| ProjId   | varchar(20) | NO   | PRI | NULL    |       |
| BranchId | int(11)     | YES  |     | NULL    |       |
| AddedOn  | datetime    | YES  |     | NULL    |       |
| Status   | int(11)     | YES  |     | NULL    |       |
+----------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)

mysql> desc codingslover ProjId;
+---------+-------------+------+-----+---------+-------+
| Field   | Type        | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| ProjId  | varchar(20) | NO   | PRI | NULL    |       |
+---------+-------------+------+-----+---------+-------+
1 row in set (0.00 sec)





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1. 413 “Request Entity Too Large” error with uploading a file

2. Difference between cookies and sessions in php

3. How to create a .webp image in PHP

4. How to expire PHP session after a period of time

5. How to resolved when Logged out sessions get restored by back button

6. why javascript contains property is not working in chrome browser

7. what are the differences between json and jsonp

8. Abstract Class in Php



























How to resolved when Logged out sessions get restored by back button?








Published on: Saturday, January 10, 2015 by Unknown - 3 comments
























How to resolved when Logged out sessions get restored by back button?



When we log out the sessions , We clear the cookies in browser. But when we press the back button after logging out the session gets restored. 




Solution:








 header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
 header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past







Related Posts:



1. 413 “Request Entity Too Large” error with uploading a file

2. Difference between cookies and sessions in php

3. How to create a .webp image in PHP

4. How to expire PHP session after a period of time

5. How to resolved when Logged out sessions get restored by back button

6. why javascript contains property is not working in chrome browser

7. what are the differences between json and jsonp

8. Abstract Class in Php



















        

      












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