I does not have rss feed for categories so i am trying to create 'rss php' file for new post and posts by categories
update
so far i did this with help from @jonasdev.
<?phpdefine('PAGE', 'site');// Create connection $con=mysqli_connect("akhbar1.com","user","pass" ,"DB");// Check connection if (mysqli_connect_errno($con)) { echo "Database connection failed!: " . mysqli_connect_error(); }function rss_date($time) { return gmdate('r', $time);}$feed_limit = (int) $_GET['l'];if ($feed_limit <= 0 || $feed_limit >= 100) { $feed_limit = 500;} $sql = "SELECT * FROM in_posts ORDER BY post_id DESC LIMIT $feed_limit"; $query = mysqli_query($con,$sql);render($_GET['r']);/** * Renders the page * @param $type */function render($type) { $items = []; render_header(); switch($type) { case 'newpost': $items[] = getItemFromDatabase(); break; case 'category': if(isset($_GET['id'])){ $get_idy = $_GET['id']; $items[] = getCategoryItemFromDatabase(); } else { echo "failed"; } break; default: $items[] = getItemFromDatabase(); } foreach($items as $item) { render_item($item["post_id"], $item["post_title"], $item["post_excerp"], $item["created_at"]); } render_footer();}/** * Renders opening RSS */function render_header() { header ('Content-type: text/xml'); echo <<< RSS<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0"><channel><title>title</title><link>https://www.akhbar1.com/</link><description>description</description>RSS;}/** * Renders closing RSS */function render_footer() { echo <<< RSS</channel></rss>RSS;}/** * Renders one RSS Item * * @param $postId * @param $postTitle * @param $postExcerp * @param $createdAt */function render_item($postId, $postTitle, $postExcerp, $createdAt) { $rssDate = rss_date($createdAt); echo <<< RSS<item><title><![CDATA[$postTitle]]></title><description>$postExcerp</description><link>https://www.akhbar1.com/news-$postId.html</link><pubDate>$rssDate</pubDate></item>RSS;}/** * * @return array */function getItemFromDatabase() { while($row = mysqli_fetch_array($con,$query)){ $title=$row["post_title"]; $link=$row["post_id"]; $description=$row["post_content"]; $createdAt=$row["created_at"]; return ["post_id" => $link,"post_title" => $title,"post_exerp" => $description,"created_at" => $createdAt, ]; }}function getCategoryItemFromDatabase() { $sel = mysqli_query($con,"SELECT * FROM in_posts WHERE post_category_id='$get_idy' ORDER BY post_id DESC LIMIT $feed_limit"); while($row = mysqli_fetch_array($con,$sel)){ $title=$row["post_title"]; $link=$row["post_id"]; $description=$row["post_content"]; $createdAt=$row["created_at"]; return ["post_id" => $link,"post_title" => $title,"post_exerp" => $description,"created_at" => $createdAt, ]; }}feed for new posts https://www.akhbar1.com/rss.php?r=newpost&l=10
feed by categories https://www.akhbar1.com/rss.php?r=category&id=1&l=10
I'm not getting anything from database
I do not know what i am doing wrong.
posts table 
categories table
