PHP Script to turn RSS feeds into JSON objects - to be consumed by JavaScript

rss.php

<?php

// Turn off all error reporting
error_reporting(0);

header('Content-Type: application/json');

$url = filter_input( INPUT_GET, 'feed', FILTER_VALIDATE_URL) ;
if($url == null || $url === false){
  $json = array('error' => 'Invalid URL');
  echo json_encode($json);
  die();
}

$feed = new DOMDocument();
$feed->load( $url );
$json = array();

$main = $feed->getElementsByTagName('channel');
if($main == null) {
  $main = $feed->getElementsByTagName('feed');
}

$json['source']       = $url;
$json['title']        = $main->item(0)->getElementsByTagName('title')->item(0)->firstChild->nodeValue;
$json['description']  = $main->item(0)->getElementsByTagName('description')->item(0)->firstChild->nodeValue;
$json['language']     = $main->item(0)->getElementsByTagName('language')->item(0)->firstChild->nodeValue;
$json['copyright']    = html_entity_decode( $main->item(0)->getElementsByTagName('copyright')->item(0)->firstChild->nodeValue );

$items = $main->item(0)->getElementsByTagName('item');

$json['items'] = array();
$i = 0;

foreach($items as $item) {

  try {
    $title          = $item->getElementsByTagName('title')->item(0)->firstChild->nodeValue;
    $description    = $item->getElementsByTagName('description')->item(0)->firstChild->nodeValue;
    $pubDate        = $item->getElementsByTagName('pubDate')->item(0)->firstChild->nodeValue;
    $link           = $item->getElementsByTagName('link')->item(0)->firstChild->nodeValue;
    $content        = $item->getElementsByTagName('content')->item(0)->firstChild->nodeValue;
    $guid           = $item->getElementsByTagName('guid')->item(0)->firstChild->nodeValue;
    
    // Get related headlines
    $description = str_replace('\\', '', $description);
    preg_match_all('/href="([^"]+)"/', $description, $related);

    $json['items'][$i] = array(
      'title'       => $title,
      'description' => html_entity_decode(strip_tags($description)),
      'pubDate'     => strtotime($pubDate),
      'link'        => $link,
      // 'content'     => strip_tags($content),
      'guid'        => $guid
    );

    if($related[1] != null && !empty($related[1])) $json['items'][$i]['related'] = $related[1];

    $i++;

   } catch( Exception $e ) {

   }
}

echo json_encode($json);

?>