How to link a HTML link like this - <a href="#">Click here to log out</a>
to a PHP function like - logout()
What I need to do is, when people click a link, php will run the php function.
Please advice! :D
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2 Answers
What I need to do is, when people click a link, php will run the php function.
You can not call a PHP (server-side language) function when clicking on a link. From your question, I suspect you want to provide a link for users to logout, below is how you should go about.
Your link should be like:
<a href="logout.php">Click here to log out</a>
And in logout.php you should put php code for logging the user out.
Code inside logout.php might look like this:
<?php
session_start();
unset($_SESSION['user']); // remove individual session var
session_destroy();
header('location: login.php'); // redirct to certain page now
?>
2 Comments
Zhaf
@Sarfarz - I'm trying to build a simple login system. So I follow this tutorial - tinsology.net/2009/06/… This is what I achieve so far - cokicoki.com/box/loginsys/reg.php Please advice me if you see something weird. Thanks!
Sarfraz
@Zhaf: It seems to be fine, however when creating such login system, you need to be aware about sql injection attacks, see more info about here: php.net/manual/en/security.database.sql-injection.php
There are a number of ways; just to get this out of the way first. There is no way to invoke a PHP function from the client side (i.e, user interaction at the browser) without a page refresh unless you use AJAX. As one answer suggests, you can put the function in a PHP page, and link to it. Here's another way
<a href="index.php?action=logout">Logout</a>
And inside index.php
<?php
switch $_GET['action']:
{
....
case 'logout': logout(); break;
...
}
?>
There are other more sophisicated methods, such as determining which function to call from URI directly, which is used by frameworks like CodeIgniter and Kohana.
