want to call a function through a button php

echo "<a href='".base_url()."' class='btn btn-sm float-left btn-info'> < - Go Back</a>";

controller name :users
function name : logout

base_url is for direct file assets like JS or CSS or images, for linking to CodeIgniter controller/method where URL might be rewritten with index.php prefix, or without, you should use site_url helper function, in this case site_url('users/logout')

Please, take some time (maybe several days) to read the CodeIgniter documentation. Without doing that, it will cost you twice the time (or more) to solve all the issues you will encounter, because you're missing so many basics.

Like making a hyperlink (button or not) refer to a controller/function:

PHP Code:

<?php echo anchor('users/logout', ' <- Go back ', 'class="btn btn-sm btn-info float-left"');?>

You must (auto)load the url helper if you want to use the anchor() function.

erm if you are new don't get in the habit of "<?php echo" "<?=" is so much cleaner instead

You can see things I made with codeigniter here: itart.pro its not overly impressive as I have very little time to learn.

Please, take some time (maybe several days) to read the CodeIgniter documentation. Without doing that, it will cost you twice the time (or more) to solve all the issues you will encounter, because you're missing so many basics.

Like making a hyperlink (button or not) refer to a controller/function:

PHP Code:

<?php echo anchor('users/logout', ' <- Go back ', 'class="btn btn-sm btn-info float-left"');?>

You must (auto)load the url helper if you want to use the anchor() function.

How to pass parameter to the function using anchor

All the information you need is here:
https://www.codeigniter.com/userguide3/g.../urls.html

Combined with:
https://www.codeigniter.com/userguide3/h...hor#anchor

All the information you need is here:
https://www.codeigniter.com/userguide3/g.../urls.html

Thanks for your support. I solve that issue.