如何用PHP把RDF内容插入Web站点之中(4)

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// this is an array of arrays, with each array element representing an
// each outer array element is itself an associative array
// with keys ("title", "link", "description")
$items = array(),

// opening tag handler
function elementBegin($parser, $name, $attributes)
{
global $currentTag, $flag,
$currentTag = $name,
// set flag if entering or block
if ($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 or 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>