如何用PHP把RDF内容插入Web站点之中(3)
时间：2007-02-17 来源：PHP爱好者
筑巢时间（Nesting Time）
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前面的例子只是用来说明问题的。如果你真想把ＲＤＦ内容插入到Ｗeb站点当中，就需要把事情做的更好一些。所以把前面的脚本的作了改进，新增了一些东西，从而简化格式化ＲＤＦ数据的任务。
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
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<html>
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<head>
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<basefont face="Verdana">
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</head>
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<body>
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<table border="0" cellspacing="5" cellpadding="5">
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<tr>
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<td><b>New releases on freshmeat.net today:</b></td>
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</tr>
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
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<?php
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// XML file
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$file = "http://www.freshmeat.net/backend/fm-releases.rdf";
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// set up some variables for use by the parser
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$currentTag = "";
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$flag = "";
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$count = 0;
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// this is an associative array of channel data with keys ("title",
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"link",
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"description")
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$channel = array();
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// this is an array of arrays, with each array element representing an
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<item> // each outer array element is itself an associative array
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// with keys ("title", "link", "description")
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$items = array();
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// opening tag handler
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function elementBegin($parser, $name, $attributes)
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{
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global $currentTag, $flag;
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$currentTag = $name;
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// set flag if entering <channel> or <item> block
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if ($name == "ITEM")
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{
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$flag = 1;
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}
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else if ($name == "CHANNEL")
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{
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$flag = 2;
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}
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}
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// closing tag handler
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function elementEnd($parser, $name)
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{
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global $currentTag, $flag, $count;
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$currentTag = "";
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// set flag if exiting <channel> or <item> block
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if ($name == "ITEM")
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{
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$count++;
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$flag = 0;
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}
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else if ($name == "CHANNEL")
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{
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$flag = 0;
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}
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}
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// character data handler
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function characterData($parser, $data)
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{
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global $currentTag, $flag, $items, $count, $channel;
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$data = trim(htmlspecialchars($data));
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if ($currentTag == "TITLE" || $currentTag == "LINK" ||
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$currentTag ==
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"DEscriptION")
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{
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// add data to $channels[] or $items[] array
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if ($flag == 1)
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{
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$items[$count][strtolower($currentTag)] .=
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$data;
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}
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else if ($flag == 2)
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{
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$channel[strtolower($currentTag)] .= $data;
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}
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}
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}
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// create parser
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$xp = xml_parser_create();
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// set element handler
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xml_set_element_handler($xp, "elementBegin", "elementEnd");
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xml_set_character_data_handler($xp, "characterData");
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xml_parser_set_option($xp, XML_OPTION_CASE_FOLDING, TRUE);
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xml_parser_set_option($xp, XML_OPTION_SKIP_WHITE, TRUE);
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// read XML file
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if (!($fp = fopen($file, "r")))
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{
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die("Could not read $file");
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}
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// parse data
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while ($xml = fread($fp, 4096))
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{
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if (!xml_parse($xp, $xml, feof($fp)))
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{
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die("XML parser error: " .
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xml_error_string(xml_get_error_code($xp)));
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}
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}
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// destroy parser
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xml_parser_free($xp);
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// now iterate through $items[] array
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// and print each item as a table row
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foreach ($items as $item)
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{
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echo "<tr><td><a href=" . $item["link"] . ">" . $item["title"] .
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"</a><br>" . $item["description"] . "</td></tr>"; }
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?>
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</table>
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</body>
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</html>
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与先前的那段的主要区别在于，这段脚本创建了两个数组，用于保存分析过程中所提取的信息。其中，$channel是联合性数组（associative array），存放被处理的频道的基本描述信息，而$items是一个二维数组，包含关于单独的频道条目（channel intems）的信息。$items数组中的每一个元素本身又是一个联合性数组，包含title,URL和description关键字。$items数组中元素总数与ＲＤＦ文档中的<item>区块总数相同。
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还需注意$flag变量的变化，根据被处理的是<channel></channel>区块还是<item></item>区块，它现在保存两个值。这一点很有必要，因为只有这样，分析器才能把信息放入正确的数组里面。
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一旦文档分析完毕，事情就简单了——遍历$items 数组，以表格形式打印其中的每一个条目（item）。远行结果如下：
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
前面的例子只是用来说明问题的。如果你真想把ＲＤＦ内容插入到Ｗeb站点当中，就需要把事情做的更好一些。所以把前面的脚本的作了改进，新增了一些东西，从而简化格式化ＲＤＦ数据的任务。
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
<html>
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
<head>
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<basefont face="Verdana">
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</head>
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<body>
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
<table border="0" cellspacing="5" cellpadding="5">
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<tr>
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<td><b>New releases on freshmeat.net today:</b></td>
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</tr>
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
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<?php
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// XML file
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$file = "http://www.freshmeat.net/backend/fm-releases.rdf";
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// set up some variables for use by the parser
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$currentTag = "";
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$flag = "";
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$count = 0;
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// this is an associative array of channel data with keys ("title",
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"link",
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"description")
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$channel = array();
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// this is an array of arrays, with each array element representing an
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<item> // each outer array element is itself an associative array
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// with keys ("title", "link", "description")
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$items = array();
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// opening tag handler
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function elementBegin($parser, $name, $attributes)
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{
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global $currentTag, $flag;
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$currentTag = $name;
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// set flag if entering <channel> or <item> block
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if ($name == "ITEM")
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{
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$flag = 1;
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}
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else if ($name == "CHANNEL")
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{
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$flag = 2;
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}
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}
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// closing tag handler
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function elementEnd($parser, $name)
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{
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global $currentTag, $flag, $count;
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$currentTag = "";
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// set flag if exiting <channel> or <item> block
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if ($name == "ITEM")
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{
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$count++;
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$flag = 0;
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}
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else if ($name == "CHANNEL")
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
{
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$flag = 0;
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
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}
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// character data handler
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
function characterData($parser, $data)
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
{
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global $currentTag, $flag, $items, $count, $channel;
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
$data = trim(htmlspecialchars($data));
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if ($currentTag == "TITLE" || $currentTag == "LINK" ||
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
$currentTag ==
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"DEscriptION")
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{
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// add data to $channels[] or $items[] array
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if ($flag == 1)
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{
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$items[$count][strtolower($currentTag)] .=
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$data;
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}
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
else if ($flag == 2)
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
{
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
$channel[strtolower($currentTag)] .= $data;
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// create parser
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
$xp = xml_parser_create();
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// set element handler
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xml_set_element_handler($xp, "elementBegin", "elementEnd");
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xml_set_character_data_handler($xp, "characterData");
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xml_parser_set_option($xp, XML_OPTION_CASE_FOLDING, TRUE);
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
xml_parser_set_option($xp, XML_OPTION_SKIP_WHITE, TRUE);
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// read XML file
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if (!($fp = fopen($file, "r")))
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{
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die("Could not read $file");
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// parse data
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while ($xml = fread($fp, 4096))
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{
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
if (!xml_parse($xp, $xml, feof($fp)))
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
{
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
die("XML parser error: " .
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
xml_error_string(xml_get_error_code($xp)));
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
}
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}
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// destroy parser
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xml_parser_free($xp);
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
// now iterate through $items[] array
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// and print each item as a table row
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foreach ($items as $item)
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
{
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
echo "<tr><td><a href=" . $item["link"] . ">" . $item["title"] .
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
"</a><br>" . $item["description"] . "</td></tr>"; }
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wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
?>
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</table>
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</body>
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
</html>
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
与先前的那段的主要区别在于，这段脚本创建了两个数组，用于保存分析过程中所提取的信息。其中，$channel是联合性数组（associative array），存放被处理的频道的基本描述信息，而$items是一个二维数组，包含关于单独的频道条目（channel intems）的信息。$items数组中的每一个元素本身又是一个联合性数组，包含title,URL和description关键字。$items数组中元素总数与ＲＤＦ文档中的<item>区块总数相同。
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
还需注意$flag变量的变化，根据被处理的是<channel></channel>区块还是<item></item>区块，它现在保存两个值。这一点很有必要，因为只有这样，分析器才能把信息放入正确的数组里面。
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
wwww.chin aitpower.comSUaT7QI0jAY1hcUcyuV9mU1zO
一旦文档分析完毕，事情就简单了——遍历$items 数组，以表格形式打印其中的每一个条目（item）。远行结果如下：
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