note 56992 added to reserved.variables

I just wrote up this function to secure forms on my site so that you can't submit a form from anywhere but your site. This is extremely effective in securing your forms from hacking attempts. <?php function form_post_check() { $referring_url = $_SERVER['HTTP_REFERER']; // get the referring URL $host = $_SERVER['HTTP_HOST']; // get the header from the current request (example: www.yoursite.com) $valid_url = 'http://'.$host.'/'; // finish defining a valid referring URL $valid_len = strlen( $valid_url ); // get the length of the valid url // if the valid url isn't the first part of the referring url if ( substr( $referring_url, 0, $valid_len ) != $valid_url ) { die( 'You submitted this form from an invalid URL.' ); // stop everything and display a message } } ?> ---- Manual Page -- http://www.php.net/manual/en/reserved.variables.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+56992 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+56992&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+56992&report=yes Search -- http://master.php.net/manage/user-notes.php