How can I clear my php session data correctly?

后端未结

关注

 3  780

离开以前

My php website flows like this:

Page1.php has an html form which POSTs to Page2.php
Page2.php stores all the POST data into SESSION variables and has

相关标签:

3条回答

暖寄归人

2020-12-11 17:00

Use session_unset(). Like this:

<?php session_start(); ?><!DOCTYPE html>
<html>
  <body>
    <?php
      $_SESSION["variabletounset"] = "I am going to be unset soon along with all of the other session variables.";
      print '<pre>' . "\n";
      print_r($_SESSION);
      print '    </pre>' . "\n";

      session_unset();

      print '    <pre>' . "\n";
      print_r($_SESSION);
      print '    </pre>' . "\n";
    ?>
  </body>
</html>

This would output:

Array
(
variabletounset => I am going to be unset soon along with all of the other session variables.
)

Array
(
)

0 讨论(0)

你的背包

2020-12-11 17:04
From the documentation:
```
If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is used,
use unset() to unregister a session variable, i.e. unset ($_SESSION['varname']);
```
And take care about session_destroy:

session_destroy destroys all of the data associated with the current session. It does not unset any of the global variables associated with the session
0 讨论(0)
发布评论:

提交评论
- 加载中...

悲哀的现实

2020-12-11 17:06

Only use session_unset() for older deprecated code that does not use $_SESSION.

see session_destroy manual

example you can try and see how it works

session.php

<?php
session_start();
$_SESSION = array('session1'=>1,'session2'=>2);

echo $_SESSION['session1']; //1
$_SESSION['session1'] = 3;
echo "<pre>";
print_r($_SESSION); //session one now updated to 3
echo "</pre>";


$_SESSION = array();
if ($_SESSION['session1']) {
 echo $_SESSION['session1']; //  IS NOW EMPTY
} else {
 echo "woops... nothing found";
}
?>
<p>
<a href="destroyed.php">NOW GOING TO DESTROYED PHP<a/>
</p>

<?php
session_destroy();
?>

destroyed.php

<?php
session_start(); // calling session start first on destroyed.php

print_r($_SESSION); // prints Array ( )  
?>

0 讨论(0)