XML Header configuration

[CaptainComedy]

Hey guys I need some help (Again)

Im making a dynamic audio player for a web site

a logged in user selects a track to add to their playlist
a button activates the playlist and a popup player is called

the player reffers to an XML document for its playlist everytime its called. But if the user was to choose another playlist, the previous playlist chosen still loads due to the xml file being in the users cache.

Does anyone know what I need to enter to disable caching of the xml file? The XML file is created by php dom and I cant find anything on caching..... any advice?

 

[probedb]

Can you change the headers sent by PHP like Cache-Control, Expires etc? I believe you can send headers using this... http://uk.php.net/manual/en/function.header.php

 

[CaptainComedy]

Not sure because I need the header to be saved in the XML file and not the php file... here is some of the code:

<?php

//I was hoping this would work but it applies to the PHP file
// Date in the past
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");


$script = ' 
<script type="text/javascript"> 

javascript:popup("http://www.gbob.com/gbobradio.html","wname")

</script>'; 

$query1 = ("select * from user_playlist_tracks where playlist_id like '$selectedplaylistid' order by date desc");
$result1 = mysql_query($query1) or die ("couldnt get track list!");


// create doctype
$dom = new DOMDocument("1.0");
	
// create root element
$root = $dom->createElement("playlist");
$dom->appendChild($root);
$dom->formatOutput=true;
	
	// create child element
	$trackList = $dom->createElement("trackList");
	$root->appendChild($trackList);	

while ($r1 = mysql_fetch_array($result1))
	{
	$trackid1 = $r1['track_id'];
	
	$query2 = ("select * from audio_song where id like '$trackid1'");
	$result2 = mysql_query($query2) or die ("couldnt get track details!");
	
	while ($r2 = mysql_fetch_array($result2))
		{
		$title2 = $r2['song_title'];
		$bandid2 = $r2['band_id'];
		$file2 = $r2['track_filename'];
		
		$location2 = "http://gbob.s3.amazonaws.com/".$file2;
		
		$query3 = ("select * from band where id like '$bandid2'");
		$result3 = mysql_query($query3) or die ("couldnt get artist info!");
		
		while ($r3 = mysql_fetch_array($result3))
			{
			$creator3 = $r3['band_name'];

				// create child element
				$track = $dom->createElement("track");
				$trackList->appendChild($track);
				
				// create child element
				$creator = $dom->createElement("creator");
				$track->appendChild($creator);
					// create text node
					$text = $dom->createTextNode("$creator3");
					$creator->appendChild($text);
				
				// create child element
				$title = $dom->createElement("title");
				$track->appendChild($title);
					// create text node
					$text = $dom->createTextNode("$title2");
					$title->appendChild($text);
				
				// create child element
				$location = $dom->createElement("location");
				$track->appendChild($location);
					// create text node
					$text = $dom->createTextNode("$location2");
					$location->appendChild($text);

			}
		}
	}
	
// save tree to file
$dom->save("playlist.xml");
	
// save tree to string
$order = $dom->save("playlist.xml");

print $script;

$data['pagenum'] = $pagenum;
$data['page'] = "playlists";
$this->load->view('user/playlists', $data);		

?>

not quite sure how to impliment

//I was hoping this would work but it applies to the PHP file
// Date in the past
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");

for the XML file....

 

[probedb]

Can you possibly server the XML file from the PHP, i.e. send a Content-Type header out from the PHP of the correct one for XML? So rather than pointing at an .xml file your pointing at a .php file but it's MIME type is XML?

 

[CaptainComedy]

I cant because the flash audio player requires it as an xml file with just xml content.

I only need to find out how to output a xml header from php :/

 

[probedb]

That's what I mean, can you give the player whatever filename you want? If it'll accept .php it's easy to get PHP to send a content type header and it will be XML that the player gets.

If you're trying to do this from an actual .xml file then you can't unless you're server parses all .xml files as PHP.

 

[Dj_Jestar]

I cant because the flash audio player requires it as an xml file with just xml content.

I only need to find out how to output a xml header from php :/

header("Content-Type: text/xml");
echo '<?xml version="1.0" ?>';
//etc

 

[CaptainComedy]

header("Content-Type: text/xml");
echo '<?xml version="1.0" ?>';
//etc

but it outputs the head data in the php file and not the xml file? I tried that and it didnt output it with the xml file. and even then it still doesnt output the expiry for the cache.

In the end I put it all in its own folder and just put a htaccess file to disable cache works fine but I'd have rather known how to get expiry from php dom now I feel more noob than before.

 

[Dj_Jestar]

<?php
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>

I think you still don't understand that you use PHP to output XML. You don't write to a file, then serve the file - you literally just output the XML directly, as you would any other type of page.

 

[CaptainComedy]

but the flash file is looking for an xml file on the server, it needs a target to look up once the xml has finished being written, it needs to be saved to file so the static flash player can read the xml file.

 

[Dj_Jestar]

Then tell it to read the php file via a request. How do you think these forums work? There are some magic php scripts tha create files which we all view via our browser? No!