how do i output an xml file using php - php

Question

I have a MySQL database on my website, and I would like to know how I could get an XML output via PHP of the following column channels in the table.
I want to make the xml output to something like this:
<?xml version="1.0" encoding="UTF-8" ?>
<tv generator-info-name="www.mysite.com/xmltv">
<channel id="">
<display-name>Information from database</display-name>
<programme channel="Information from database" start="" stop="">
<title lang="en"></title>
<sub-title lang="en">
</sub-title>
<desc lang="en"></desc>
<category lang="en"></category>
</programme>
</channel>
Here is the php code:
<?php
function db_connect()
{
define('DB_HOST', 'localhost');
define('DB_USER', 'myusername');
define('DB_PASSWORD', 'mypasword');
define('DB_DATABASE', 'mydbname');
$errmsg_arr = array();
$errflag = false;
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link)
{
die('Failed to connect to server: ' . mysql_error());
}
$db = mysql_select_db(DB_DATABASE);
if(!$db)
{
die("Unable to select database");
}
}
db_connect();
function clean($var)
{
return mysql_real_escape_string(strip_tags($var));
}
$channels = clean($_GET['channels']);
$id = clean($_GET['id']);
if($errflag)
{
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
echo implode('<br />',$errmsg_arr);
}
else
{
$insert = array();
if(isset($_GET['channels']))
{
$insert[] = 'channels = \'' . clean($_GET['channels']) .'\'';
}
if(isset($_GET['id']))
{
$insert[] = 'id = \'' . clean($_GET['id']) . '\'';
}
if($channels && $id)
{
$qrytable1="SELECT id, channels, links FROM tvguide WHERE channels='$channels' && id='$id'";
$result1=mysql_query($qrytable1) or die('Error:<br />' . $qry . '<br />' . mysql_error());
while ($row = mysql_fetch_array($result1))
{
...
}
mysql_close();
}
else if(!$channels && ! $id)
{
$qrytable1="SELECT id, channels, links, streams FROM tvguide";
$result1=mysql_query($qrytable1) or die('Error:<br />' . $qry . '<br />' . mysql_error());
echo '<?xml version=""1.0"" encoding="UTF-8" ?>';
echo '<tv generator-info-name="www.mysite.com/xmltv">';
echo '<channel id="">';
echo '<display-name></display-name>';
echo '<programme channel="" start="" stop="">';
echo '<title lang="en"></title>';
echo '<sub-title lang="en"></sub-title>';
echo '<desc lang="en"></desc>';
echo '<category lang="en"></category>';
echo '</programme>';
echo '</channel>';
while ($row = mysql_fetch_array($result1))
{
echo "<p id='channels'>".$row["id"]. " " . $row["channels"]. "</p>";
}
}
}
?>
I would really appreciate it if you could tell me how to do this. Please note; I am a complete noob at PHP and ANY supplied code will be of great help.
Edit: I'm generating an XML file to save in my web host, but I can't be able to read the XML file as I'm getting an error error on line 3 at column 1: Extra content at the end of the document.
Here's the XML output:
<?xml version="1.0" encoding="UTF-8"?>
<tv generator-info-name="www.mysite.com/xmltv"/>
<channel><display-name>Information from database</display-name><programme/><desc/></channel>

Answer 1

I'd suggest to use XMLWriter. http://www.php.net/manual/en/ref.xmlwriter.php.
I see you use mysql... Instead I'd suggest to use mysqli to connect to the database, instead of the deprecated mysql. It is the improved extension.
You could do something like this:
$xml = new XMLWriter();
$xml->openMemory();
$xml->startDTD('xml');
$xml->endDTD();
$xml->startElement('tv');
$xml->startAttribute('generator-info-name');
$xml->text('www.mysite.com/xmltv');
$xml->endAttribute();
$xml->startElement('channel');
$xml->startAttribute('id');
$xml->text('');
$xml->endAttribute();
$xml->endElement();
$xml->endElement();
$xml->endElement();
header("Content-type: text/xml; charset=utf-8");
echo $xml->outputMemory();
Good luck with it :)

Answer 2

Here's some example code using PHP's built in classes to build an XML tree. This isn't 100% of what you're asking for, but it demonstrates how to create the structure, add children, add attributes, etc. Using this snippet, you can get there from here. I use indentation to help me keep the tree structure straight...
// create a dom document with encoding utf8
$domtree = new DOMDocument('1.0', 'UTF-8');
// create a root element of the xml tree
$tv = $domtree->createElement('tv');
//create attributes for element
$generator_info_name = $domtree->createAttribute('generator-info-name');
$generator_info_name->value = 'www.mysite.com/xmltv';
//append attribute
$tv->appendChild($generator_info_name);
// append element to the doc
$tv = $domtree->appendChild($tv);
//add a channel as a child of the root
$channel = $domtree->createElement('channel');
$channel_id = $domtree->createAttribute('id');
$channel_id->value = '""';
$channel = $tv->appendChild($channel);
//append children to channel
$channel->appendChild($domtree->createElement('display-name','Information from database'));
$channel->appendChild($domtree->createElement("programme"));
$channel->appendChild($domtree->createElement('desc'));
//finally, save the file
echo $domtree->saveXML();
$domtree->save('myChannel.xml');