Gazelle/sections/forums/delete_poll_option.php

<?
authorize();
if (!check_perms('site_moderate_forums')) {
	error(404);
}

$ThreadID = $_GET['threadid'];
$PollOption = $_GET['vote'];

if (is_number($ThreadID) && is_number($PollOption)) {
	$DB->query("
		SELECT ForumID
		FROM forums_topics
		WHERE ID = $ThreadID");
	list($ForumID) = $DB->next_record();
	if (!in_array($ForumID, $ForumsRevealVoters)) {
		error(403);
	}

	$DB->query("
		SELECT Answers
		FROM forums_polls
		WHERE TopicID = $ThreadID");
	if (!$DB->has_results()) {
		error(404);
	}

	list($Answers) = $DB->next_record(MYSQLI_NUM, false);
	$Answers = unserialize($Answers);
	unset($Answers[$PollOption]);
	$Answers = serialize($Answers);

	$DB->query("
		UPDATE forums_polls
		SET Answers = '".db_string($Answers)."'
		WHERE TopicID = $ThreadID");
	$DB->query("
		DELETE FROM forums_polls_votes
		WHERE Vote = $PollOption
			AND TopicID = $ThreadID");

	$Cache->delete_value("polls_$ThreadID");
	header("Location: forums.php?action=viewthread&threadid=$ThreadID");
} else {
	error(404);
}