我正在尝试更改我的RSS提要标题，以便提前显示帖子类型，但它不起作用。

代码如下。有什么想法吗？

谢谢

function changeRSStitles($content) {

global $post;

if (get_post_type($post) == \'literature\') {
    $content = \'Literature: \'.$content;
} else if (get_post_type($post) == \'recipe\') {
    $content = \'Recipe: \'.$content;
} else if (get_post_type($post) == \'restaurant\') {
    $content = \'Restaurant: \'.$content;
} else if (get_post_type($post) == \'post\') {
    $content = \'Sugar Street Blog: \'.$content;
}else {
    $content = $content;
}

return $content;
}

add_filter(\'the_title_rss\', \'changeRSStitles\');