[PHP] RSS Reading...

Conrad11 · 12 Feb 2006 at 22:00

Hi there,

I am creating a little RSS reader. I don't have any PHP space at the moment so I am doing it locally so I will just show you the script.

I want the RSS to be shown in an image and I am using the following script, but whenever it is exected it just shows the image with no text.

What could be the problem?

Code:

<?php
class RSSParser {

	var $insideitem = false;
	var $tag = "";
	var $title = "";

	function startElement($parser, $tagName, $attrs) {
		if ($this->insideitem) {
			$this->tag = $tagName;
		} elseif ($tagName == "ITEM") {
			$this->insideitem = true;
		}
	}

	function endElement($parser, $tagName) {
		if ($tagName == "ITEM") {
			$slogan = vsprintf("%s",(trim($this->title)));
			$this->title = "";
			$this->insideitem = false;
		}
	}

	function characterData($parser, $data) {
		if ($this->insideitem) {
		switch ($this->tag) {
			case "TITLE":
			$this->title .= $data;
			break;
			case "DESCRIPTION":
			$this->description .= $data;
			break;
			case "LINK":
			$this->link .= $data;
			break;
		}
		}
	}
}


$xml_parser = xml_parser_create();
$rss_parser = new RSSParser();
xml_set_object($xml_parser,&$rss_parser);
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
$fp = fopen("http://ws.audioscrobbler.com/1.0/user/Cool_Guy/recenttracks.rss","r")
	or die("Error reading RSS data.");
while ($data = fread($fp, 4096))
	xml_parse($xml_parser, $data, feof($fp))
		or die(sprintf("XML error: %s at line %d", 
			xml_error_string(xml_get_error_code($xml_parser)), 
			xml_get_current_line_number($xml_parser)));
fclose($fp);
xml_parser_free($xml_parser);

$im = imagecreatetruecolor(400, 100);

$white = imagecolorallocate($im, 255, 255, 255);
$blue = imagecolorallocate($im, 0, 0, 147);
$font = "VERDANA.TTF";

imagefill($im, 0, 0, $white);

imagerectangle($im, 0, 0, 399, 99, $blue);

imagettftext($im, 8, 0, 5, 15, $blue, $font, $slogan);

header("Content-Type: image/png");
imagepng($im);
imagedestroy($im);

?>

Thanks...

[EDIT]

Just had a brainwave, I think I should write them to a text file first....

Conrad11 · 12 Feb 2006 at 22:21

Merci Beacoup pour le link, but I have figured out what I have been doing wrong.....I have freed all the parse data yet I am still trying to use it after its freed, this is why I am getting nothing....?

Am I right?

I will have a look at the link now....

Conrad11 · 13 Feb 2006 at 15:21

Hi there,

I have another quick PHP question.......I have no put an array in the class, how can I access the array outside the class?

Thanks...

Conrad11 · 13 Feb 2006 at 15:27

Hi there,

I just used global and it worked, but could you explain what is meant instantiate?

Thanks...

Conrad11 · 13 Feb 2006 at 16:18

Ah, I see now....thanks for the elabouration

I have fixed my RSS Reader now and It works fine.

Thanks again for all your help

Conrad11 · 13 Feb 2006 at 17:40

Hi there,

Surely I wouldnt want to cache them as they are dynamic and are changing a lot....?

Thanks...

Conrad11 · 13 Feb 2006 at 23:06

Hi there,

I hear ya robmiller and I have tried to implement your suggestion with what seems success.

Here is the code for anyone that wants it:

Code:

<?php

$textfile = "tracks.txt";

if(filemtime($textfile) + (3 * 60) < time())
{

$fh1 = fopen($textfile, 'w+') or die("can't open file");
fwrite($fh1, "");
fclose($fh1);

class RSSParser {

	var $insideitem = false;
	var $tag = "";
	var $title = "";

	function startElement($parser, $tagName, $attrs) {
		if ($this->insideitem) {
			$this->tag = $tagName;
		} elseif ($tagName == "ITEM") {
			$this->insideitem = true;
		}
	}

	function endElement($parser, $tagName) {
		if ($tagName == "ITEM") {
			$textfile = "tracks.txt";
			$fh = fopen($textfile, 'a+') or die("can't open file");
			$tracks = sprintf("%s\n",(trim($this->title)));
			fwrite($fh, $tracks);
			fclose($fh);
			$this->title = "";
			$this->insideitem = false;
		}
	}

	function characterData($parser, $data) {
		if ($this->insideitem) {
		switch ($this->tag) {
			case "TITLE":
			$this->title .= $data;
			break;
			case "DESCRIPTION":
			$this->description .= $data;
			break;
			case "LINK":
			$this->link .= $data;
			break;
		}
		}
	}
}


$xml_parser = xml_parser_create();
$rss_parser = new RSSParser();
xml_set_object($xml_parser,&$rss_parser);
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
$fp = fopen("http://ws.audioscrobbler.com/1.0/user/Cool_Guy/recenttracks.rss","r")
	or die("Error reading RSS data.");
while ($data = fread($fp, 4096))
	xml_parse($xml_parser, $data, feof($fp))
		or die(sprintf("XML error: %s at line %d", 
			xml_error_string(xml_get_error_code($xml_parser)), 
			xml_get_current_line_number($xml_parser)));
fclose($fp);
xml_parser_free($xml_parser);

}

if ($slogans = @file("tracks.txt"))
{
$slogan = $slogans[0];
} else {
$slogan = "No Recent Music";
}

$im = imagecreatefrompng('background.png');

$blue = imagecolorallocate($im, 0, 0, 147);
$font = "font.ttf";

imagettftext($im, 10, 0, 112, 73, $blue, $font, $slogan);

header("Content-Type: image/png");
imagepng($im);
imagedestroy($im);


?>

Which gives me this:

Thanks for all your help.

Thanks...