Как сделать вывод только с 1 категории через custom?

if( preg_match( "#categoryexclude=['"](.+?)['"]#i", $param_str, $match ) ) {

	if( preg_match( "#only_category=['"](.+?)['"]#i", $param_str, $match ) ) {
		$cats_select = true;

		$temp_array = array();

		$match[1] = explode (',', $match[1]);

		foreach ($match[1] as $value) {

			if( count(explode('-', $value)) == 2 ) $temp_array[] = get_mass_cats($value);
			else $temp_array[] = intval($value);

		}

		if( $config['allow_multi_category'] ) {
			
			$cat_join = "INNER JOIN (SELECT DISTINCT(" . PREFIX . "_post_extras_cats.news_id) FROM " . PREFIX . "_post_extras_cats WHERE cat_id = '" . $temp_array[0] . "') c ON (p.id=c.news_id) ";
		
		} else {

			$where[] = "p.category = '" . $temp_array[0] . "'";
		
		}
	}