Button connect DB

I have a website where there is a "Add to my favorites" button. I want it to make it when user click on the button to check if the user is logged in and if it isto connect to the DB and to add a data into the DB, if he is not logged in to say "You are not logged in". I know how to write the PHP code but i need some help for the button or link it doesent matter

Any help

 

Are you wanting an AJAX like feature? Or a basic POST form submit?

Either or, you will be required to use a server side scripting language such as PHP.

Pretty simple really, for a HTML <form> to POST data.

<?php
$error_flag = FALSE;
$output_message = '';
if( TRUE == isset($_POST['submit']) ) {
/* Do check here for user status. */
if( FALSE == $user->is_logged_in() ) {
$output_message = 'You are not logged in.';
$error_flag = TRUE;
}

/* Do check here for Database connection */
if( FALSE == $db->is_connected() ) {
$error_flag = TRUE;
}

if( FALSE == $error_flag ) {
     /* Do operations needed if the user is logged in and DB connection is made */
}
}
?>
<!-- HTML Code -->
<!-- Echo $output_message -->
<?= $output_message; ?>

<form action="<?= $_SERVER['PHP_SELF']; ?>" method="post">
<input type="submit" name="submit" value="Button to Do Something" />
</form>

Code (markup):

Let me know if this basic example helps you out at all.

 

Yes but how to make it the AJAX or the Javascript coding. That i dont know. And how to connect that code with the PHP script