RSSWriter

rss10.inc

<?php

// PHP 7 changes made 2018/09/16 artlung
// Joe Crawford <mailto:joe@artlung.com>
//
// $Id: rss10.inc,v 1.2 2006/05/08 03:13:40 arensb Exp $
//
// A convenience class to make it easy to write RSS classes
// Edd Dumbill <mailto:edd+rsswriter@usefulinc.com>
//
// $Log: rss10.inc,v $
// Revision 1.2  2006/05/08 03:13:40  arensb
// Cleaned up indentation, K&R style.
//
// Revision 1.1.1.1  2006/04/26 12:23:02  arensb
// Mirror of Subversion source, so I can keep track of my changes.
//
// Revision 1.3  2001/05/20 17:58:02  edmundd
// Final distribution tweaks.
//
// Revision 1.2  2001/05/20 17:41:30  edmundd
// Ready for distribution.
//
// Revision 1.1  2001/05/20 17:01:43  edmundd
// First functional draft of code working.
//
// Revision 1.1  2001/05/17 18:17:46  edmundd
// Start of a convenience library to help RSS1.0 creation
//

class RSSWriter {

    var $chaninfo = [];
    var $website;
    var $items;
    var $modules;
    var $channelURI;
    var $image;

    /**
     * RSSWriter constructor.
     * @param $uri
     * @param $title
     * @param $description
     * @param array $meta
     */
    function __construct($uri, $title, $description, $meta=array()) {
        $this->chaninfo=array();
        $this->website=$uri;
        $this->chaninfo["link"]=$uri;
        $this->chaninfo["description"]=$description;
        $this->chaninfo["title"]=$title;
        $this->items=array();
        $this->modules=array("dc" => "http://purl.org/dc/elements/1.1/");
        // thanks James Mills for bugfix to this line
        $this->channelURI=str_replace("&", "&amp;", "http://" . $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"]);
        foreach ($meta as $key => $value) {
            $this->chaninfo[$key]=$value;
        }
    }

    /**
     * @param $prefix
     * @param $uri
     */
    function useModule($prefix, $uri) {
        $this->modules[$prefix]=$uri;
    }

    /**
     * @param $imgURI
     * @param $imgAlt
     * @param int $imgWidth
     * @param int $imgHeight
     */
    function setImage($imgURI, $imgAlt, $imgWidth=88, $imgHeight=31) {
	$this->image=array(
		"uri" => $imgURI, "title" => $imgAlt, "width" => $imgWidth,
		"height" => $imgHeight
                );
    }

    /**
     * @param $uri
     * @param $title
     * @param array $meta
     */
    function addItem($uri, $title, $meta=array()) {
        $item=array("uri" => $uri, "link" => $uri,
            "title" => $this->deTag($title));
        foreach ($meta as $key => $value)
            {
            if ($key == "description" || $key == "dc:description")
                    {
                $value=$this->deTag($value);
            }
            $item[$key]=$value;
        }
        $this->items[]=$item;
    }

    /**
     *
     */
    function serialize() {
        $this->preamble();
        $this->channelinfo();
        $this->image();
        $this->items();
        $this->postamble();
    }

    /**
     * @param $in
     * @return null|string|string[]
     */
    function deTag($in) {
            while(preg_match('/<[^>]+>/', $in)) {
              $in = preg_replace('/<[^>]+>/', '', $in);
            }
            return $in;
    }

    /**
     *
     */
    function preamble() {
        header("Content-type: text/xml");
        print '<?xml version="1.0" encoding="utf-8"?>';
        print '<rdf:RDF ';
        print '         xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"';
        print '         xmlns="http://purl.org/rss/1.0/"';
        print "\n";
        foreach ($this->modules as $prefix => $uri) {
            print "         xmlns:${prefix}=\"${uri}\"\n";
        }
        print ">\n\n";
    }

    /**
     *
     */
    function channelinfo() {
        print '  <channel rdf:about="' .  $this->channelURI . '">';
        print "\n";
        $i=$this->chaninfo;
        foreach (array("title", "link", "dc:source", "description",
                    "dc:language", "dc:publisher",
            "dc:creator", "dc:rights") as $f) {
            if (isset($i[$f])) {
                print "    <${f}>" . htmlspecialchars($i[$f]) . "</${f}>\n";
            }
        }
        if (isset($this->image)) {
            print "    <image rdf:resource=\"" . htmlspecialchars($this->image["uri"]) . "\" />\n";
        }
        print "    <items>\n";
        print "      <rdf:Seq>\n";
        foreach ($this->items as $i) {
            print "        <rdf:li rdf:resource=\"" . htmlspecialchars($i["uri"]) . "\" />\n";
        }
        print "      </rdf:Seq>\n";
        print "    </items>\n";
        print "  </channel>\n\n";
    }

    /**
     *
     */
    function image() {
        if (isset($this->image)) {
            print "  <image rdf:about=\"" . htmlspecialchars($this->image["uri"]) . "\">\n";
            print "     <title>" . htmlspecialchars($this->image["title"]) . "</title>\n";
            print "     <url>" . htmlspecialchars($this->image["uri"]) . "</url>\n";
            print "     <link>" . htmlspecialchars($this->website) . "</link>\n";
            if ($this->chaninfo["description"])
                print "     <dc:description>" .
                    htmlspecialchars($this->chaninfo["description"]) .
                    "</dc:description>\n";
            print "  </image>\n\n";
        }
    }

    /**
     *
     */
    function postamble() {
        print '</rdf:RDF>';
    }

    /**
     *
     */
    function items() {
        foreach ($this->items as $item) {
            print "  <item rdf:about=\"" .  htmlspecialchars($item["uri"]) . "\">\n";
            foreach ($item as $key => $value) {
                if ($key!="uri") {
                    if (is_array($value)) {
                        foreach ($value as $v1) {
                            print "    <${key}>" . htmlspecialchars($v1) . "</${key}>\n";
                        }
                    } else {
                        print "    <${key}>" . htmlspecialchars($value) . "</${key}>\n";
                    }
                }
            }
            print "  </item>\n\n";
        }
    }

}

?>