PHP / XML Help

ronniebrown · January 19, 2008

Hi,

I've got a test page up at http://ronniebrown.co.uk/parse_freshmeat.php. THis page is pulling in XML from Last.fm - http://ws.audioscrobbler.com/1.0/user/ronniebrown/recenttracks.xml and I have PHP written to render it on screen.

My problem is that only the "artist" is being brought back; neither of the other two elements (url, track) are rendered on screen.

My PHP code is below. Any help much appreciated.

<?php
if( ! ($fp = fopen("http://ws.audioscrobbler.com/1.0/user/ronniebrown/recenttracks.xml" , "r" )) )
  die("Couldn't open xml file!");
$item_counter = 0;
$in_item_tag = 0;
$fm_current_tag_state = '';
$fm_headline_data = array();
function startElementHandler( $parser, $element_name, $element_attribs )
{
  global $item_counter;
  global $in_item_tag;
  global $fm_current_tag_state;
  global $fm_headline_data;
  if( $element_name == "TRACK" )
  {
    $in_item_tag = 1;
  }
  if( $in_item_tag == 1 )
  {
    $fm_current_tag_state = $element_name;
  }
  else
  {
    $fm_current_tag_state = '';
  }
}
function endElementHandler( $parser, $element_name )
{
  global $item_counter;
  global $in_item_tag;
  global $fm_current_tag_state;
  global $fm_headline_data;
  $fm_current_tag_state = '';
  if( $element_name == "TRACK" )
  {
    $item_counter++;
    $in_item_tag = 0;
  }
}
function characterDataHandler( $parser , $data )
{
  global $item_counter;
  global $in_item_tag;
  global $fm_current_tag_state;
  global $fm_headline_data;
  if( $fm_current_tag_state == '' || $in_item_tag == 0 )
    return;
  if( $fm_current_tag_state == "URL" ) {
    $fm_headline_data[$item_counter]["url"] = $data;
  }
  if( $fm_current_tag_state == "TRACK" ) {
    $fm_headline_data[$item_counter]["track"] = $data;
  }
  if( $fm_current_tag_state == "ARTIST" ) {
    $fm_headline_data[$item_counter]["artist"] = $data;
  }
}
if( !($xml_parser = xml_parser_create()) )
  die("Couldn't create XML parser!");

xml_set_element_handler($xml_parser, "startElementHandler", "endElementHandler");
xml_set_character_data_handler( $xml_parser , "characterDataHandler" );
while( $data = fread($fp, 4096) )
{
  if( !xml_parse($xml_parser, $data, feof($fp)) )
  {
    break; // get out of while loop if we're done with the file
  }
}
xml_parser_free($xml_parser);
?>
<HTML>
<HEAD>
<TITLE>Music</TITLE>
</HEAD>

<BODY BGCOLOR="#ffffff">

<H3>Music</H3>
<BR>
<?php

for( $i=0 ; $i < $item_counter ; ++$i )
{
  printf("<A HREF=\"%s\">%s</a> - %s<br>\n" , $fm_headline_data[$i]["url"] , 
                                              $fm_headline_data[$i]["track"] ,
                                              $fm_headline_data[$i]["artist"] );
}

?>

</BODY>
</HTML>

Daniel0 · January 19, 2008

If you're using PHP 5 (which you should be!) then I've written a tutorial which explains how to parse XML data using PHP: http://www.phpfreaks.com/tutorials/155/0.php

It shouldn't be too hard to follow.

ronniebrown · January 19, 2008

Hi Daniel,

Thanks for the prompt reply.

I took a look at the tutorial and came up with this page, which seems to reach the data ok but doesn't seem to loop through and return the results:

http://ronniebrown.co.uk/test.php

This is the (slightly) changed code:

<?php
$rss = new SimpleXMLElement('http://ws.audioscrobbler.com/1.0/user/ronniebrown/recenttracks.xml', null, true);

echo "<h1><a href='{$rss->track->artist}'>{$rss->track->artist}</a></h1>".PHP_EOL.'<hr />'.PHP_EOL;

foreach($rss->xpath('track/artist') as $item)
{
    echo <<<EOF
<h2><a href='{$item->url}'>{$item->title}</a></h2>
<div>Posted at: {$item->date}</div>
{$item->track}
<hr />

EOF;
}
?>

What am I doing wrong?

Thanks

Daniel0 · January 20, 2008

Try

<?php
$tracks = new SimpleXMLElement('http://ws.audioscrobbler.com/1.0/user/ronniebrown/recenttracks.xml', null, true);

foreach($tracks as $track)
{
    echo <<<EOF
Name: {$track->name}<br />
Artist: {$track->artist}<br />
<a href='{$track->url}'>{$track->url}</a>
<hr />

EOF;
}
?>

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