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function addCatToTitle($content) {
	$postcat = "";
	foreach((get_the_category()) as $cat) {
		if ($cat->cat_name == "News") {
		$postcat = "NEWS - ";
		} else if ($cat->cat_name == "Bagni" || $cat->cat_name == "Appartamenti" || $cat->cat_name == "Commerciale" || $cat->cat_name == "Camere per ragazzi" || $cat->cat_name == "Camere da letto" || $cat->cat_name == "Cucine" ) {
		$postcat = "PROGETTI - ";
		}
	}
	$content = $postcat.$content;
	return $content;
	}
add_filter('the_title_rss', 'addCatToTitle');