source: Common/RSS.php

<?php

class RSS
{
  public string $Charset;
  public string $Title;
  public string $Link;
  public string $Description;
  public string $WebmasterEmail;
  public array $Items;

  function __construct()
  {
    $this->Charset = 'utf8';
    $this->Title = '';
    $this->Link = '';
    $this->Description = '';
    $this->WebmasterEmail = '';
    $this->Items = array();
  }

  function Generate(): string
  {
    $Result = '<?xml version="1.0" encoding="'.$this->Charset.'" ?>'."\n". //<?
  '<rss version="2.0">'."\n".
  "  <channel>\n".
  "    <title>".$this->Title."</title>\n".
  "    <link>".$this->Link."</link>\n".
  "    <description>".$this->Description."</description>\n".
  "    <language>cs</language>\n".
  "    <webMaster>".$this->WebmasterEmail."</webMaster>\n".
  "    <pubDate>".date('r')."</pubDate>\n".
  "    <ttl>20</ttl>\n";
    foreach ($this->Items as $Item)
    {
      $Result .= "    <item>\n".
        '      <title>'.htmlspecialchars($Item['Title'])."</title>\n".
        '      <description>'.htmlspecialchars($Item['Description'])."</description>\n".
  '      <pubDate>'.date('r',$Item['Time'])."</pubDate>\n".
  '      <link>'.$Item['Link']."</link>\n".
        "    </item>\n";
    }
    $Result .= "  </channel>\n".
    "</rss>";
    return $Result;
  }
}