<?xml version="1.0" encoding="ISO-8859-1"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns="http://purl.org/rss/1.0/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
>
<channel rdf:about="http://freshmeat.net/">
<title>freshmeat.net</title>
<link>http://freshmeat.net/</link>
<description>freshmeat.net maintains the Web's largest index of Unix
and cross-platform open source software. Thousands of applications are
meticulously cataloged in the freshmeat.net database, and links to new
code are added daily.</description>
<dc:language>en-us</dc:language>
<dc:subject>Technology</dc:subject>
<dc:publisher>freshmeat.net</dc:publisher>
<dc:creator>freshmeat.net contributors</dc:creator>
<dc:rights>Copyright (c) 1997-2002 OSDN</dc:rights>
<dc:date>2002-02-11T10:20+00:00</dc:date>
<items>
<rdf:Seq>
<rdf:li rdf:resource="http://freshmeat.net/releases/69583/" />
<rdf:li rdf:resource="http://freshmeat.net/releases/69581/" />
// set up some variables for use by the parser
$currentTag = "";
$flag = "";
// 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);
// 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);
// opening tag handler
function elementBegin($parser, $name, $attributes)
{
global $currentTag, $flag;
// export the name of the current tag to the global scope
$currentTag = $name;
// if within an item block, set a flag
if ($name == "ITEM")
{
$flag = 1;
}
}
// closing tag handler
function elementEnd($parser, $name)
{
global $currentTag, $flag;
$currentTag = "";
// if exiting an item block, print a line and reset the flag
if ($name == "ITEM")
{
echo "<hr>";
$flag = 0;
}
}
// character data handler
function characterData($parser, $data)
{
global $currentTag, $flag;
// if within an item block, print item data
if (($currentTag == "TITLE" || $currentTag == "LINK" ||
$currentTag ==
"DESCRIPTION") && $flag == 1)
{
echo "$currentTag: $data <br>";
}
}
?>
看不分明？ 别焦急，前面将会作出注释。
捕捉旗标
这段剧本起首要做的是设定一些全局变量：
// XML file
$file = "fm-releases.rdf";
// set up some variables for use by the parser
$currentTag = "";
$flag = "";
// opening tag handler
function elementBegin($parser, $name, $attributes)
{
global $currentTag, $flag;
// export the name of the current tag to the global scope
$currentTag = $name;
// if within an item block, set a flag
if ($name == "ITEM")
{
$flag = 1;
}
}
// closing tag handler
function elementEnd($parser, $name)
{
global $currentTag, $flag;
$currentTag = "";
// if exiting an item block, print a line and reset the flag
if ($name == "ITEM")
{
echo "<hr>";
$flag = 0;
}
}
闭标志处置函数也是以标志称号作为其参数。假如是碰到的是一个为</item>的闭标志，变量$flag的值重置为0，并把变量$currentTag的值清空。
// character data handler
function characterData($parser, $data)
{
global $currentTag, $flag;
// if within an item block, print item data
if (($currentTag == "TITLE" || $currentTag == "LINK" ||
$currentTag ==
"DESCRIPTION") && $flag == 1)
{
echo "$currentTag: $data <br>";
}
}