web| Insert | Site nesting time (Nesting times)
The previous example is just for illustration of the problem. If you really want to insert RDF content into a Web site, you need to do something a little better. So the previous script has been improved to add something to simplify the task of formatting RDF data.
<basefont face= "Verdana" >
<body>
<table border= "0" cellspacing= "5" cellpadding= "5" >
<tr>
<td><b>new releases on Freshmeat.net today:</b></td>
</tr>
<?php
XML file
$file = "HTTP://WWW.FRESHMEAT.NET/BACKEND/FM-RELEASES.RDF";
Set up some variables for use by the parser
$currentTag = "";
$flag = "";
$count = 0;
This is a associative array of channel data with keys ("title")
"Link",
"description")
$channel = Array ();
This is the arrays with the each array element representing an
<item>//each outer array element was itself an associative array
With keys ("title", "link", "description")
$items = Array ();
Opening Tag Handler
function Elementbegin ($parser, $name, $attributes)
{
Global $currentTag, $flag;
$currentTag = $name;
Set flag if entering <channel> or <item> block
if ($name = = "ITEM")
{
$flag = 1;
}
else if ($name = = "CHANNEL")
{
$flag = 2;
}
}
Closing Tag Handler
function Elementend ($parser, $name)
{
Global $currentTag, $flag, $count;
$currentTag = "";
Set flag if exiting <channel> or <item> block
if ($name = = "ITEM")
{
$count + +;
$flag = 0;
}
else if ($name = = "CHANNEL")
{
$flag = 0;
}
}
Character Data Handler
function Characterdata ($parser, $data)
{
Global $currentTag, $flag, $items, $count, $channel;
$data = Trim (Htmlspecialchars ($data));
if ($currentTag = = "TITLE" | | $currentTag = = "LINK" | |
$currentTag = =
"DESCRIPTION")
{
Add data to $channels [] or $items [] array
if ($flag = = 1)
{
$items [$count][strtolower ($CURRENTTAG)]. =
$data;
}
else if ($flag = = 2)
{
$channel [Strtolower ($currentTag)]. = $data;
}
}
}
Create parser
$XP = Xml_parser_create ();
Set Element Handler
Xml_set_element_handler ($XP, "Elementbegin", "elementend");
Xml_set_character_data_handler ($XP, "characterdata");
Xml_parser_set_option ($xp, xml_option_case_folding, TRUE);
Xml_parser_set_option ($xp, Xml_option_skip_white, TRUE);
Read XML file
if (!) ( $fp = fopen ($file, "R"))
{
Die ("Could not read $file");
}
Parse data
while ($xml = Fread ($fp, 4096))
{
if (!xml_parse ($XP, $xml, feof ($FP))
{
Die ("XML parser Error:".)
Xml_error_string (Xml_get_error_code ($XP)));
}
}
Destroy parser
Xml_parser_free ($XP);
Now iterate through $items [] Array
and print each item as a table row
foreach ($items as $item)
{
echo "<tr><td><a href=". $item ["link"]. ">". $item ["title"].
"</a><br>". $item ["description"]. "</td></tr>"; }
?>
</table>
</body>
The main difference from the previous paragraph was that the script created two arrays to hold the information extracted during the analysis. The $channel is a federated array (associative array) that holds the basic description of the channel being processed, and $items is a two-dimensional array containing information about the individual channel entries (channel Intems). Each element in the $items array is itself a federated array containing the Title,url and description keywords. The total number of elements in the $items array is the same as the total number of <item> blocks in the RDF document.
Also note the change in the $flag variable, which now holds two values, depending on whether the <channel></channel> block or <item></item> block is being processed. This is necessary because only in this way can the parser put information into the correct array.
Once the document is parsed, things are simple--traverse the $items array and print each entry (item) in a tabular format.
