pear中几个实用的xml代码库

1.XML_Beautifier

用于将一段排版凌乱的XML文档美化

 <?php
 require_once "XML/Beautifier.php";
 $fmt = new XML_Beautifier();
 $result = $fmt->formatFile('originalFile.xml', 'beautifiedFile.xml');
 if (PEAR::isError($result)) {
     echo $result->getMessage();
     exit();
  }
 echo "File beautified, awaiting orders!<br />";
  ?>

2.XML_DTD

引用外部的dtd文件以对xml内容进行验证

 <?php
 require_once 'XML/DTD/XmlValidator.php';
 $dtd_file = realpath('myfile.dtd');
 $xml_file = realpath('myfile.xml');
 $validator = new XML_DTD_XmlValidator();
 if (!$validator->isValid($dtd_file, $xml_file)) {
     die($validator->getMessage());
 }
  ?>

3.XML_Feed_Parser

解析各种主流格式的Feed(xml,atom,rss1,rss2等格式)

 <?php
 /* The file you wish to parse */
 $source = 'my_source.xml';
  /* Where Relax NG is available, we can force validation of the feed */
 $validate = true;
  /* Whether or not to suppress non-fatal warnings */
 $suppress_warnings = false;
 /* If the feed is not valid XML and the tidy extension is installed we can * attempt to use it to fix the feed */
 $use_tidy = true;
 $feed = new XML_Feed_Parser($source, $validate, $suppress_warnings, $use_tidy);
 foreach ($feed as $entry) {
     print $entry->title . "\n";
 }
 $first_entry = $feed->getEntryByOffset(0);
 $particular_entry = $feed->getEntryById('http://jystewart.net/entry/1');
  ?>

4.XML_Parser

SAX模型的 XML 解析器，相对于DOM解析器在解析时需要将这个xml树加载到内存中，SAX在某些应用中表现的更加轻量级。

 <?php
 require_once 'XML/Parser.php';
 class myParser extends XML_Parser {
     function myParser() {
         parent::XML_Parser();
     }
      /** * 处理起始标签 * * @access private * @param resource xml parser 句柄 *    @param string 标签名 * @param array 属性值 */
     function startHandler($xp, $name, $attribs) {
         printf('handle start tag: %s<br />', $name);
     }
      /** * 处理结束标签 * * @access private * @param resource xml parser 句柄 * @param string 标签名 */
     function endHandler($xp, $name) {
         printf('handle end tag: %s<br />', $name);
     }
     /** * 处理字符数据 * * @access private * @param resource xml parser 句柄 * @param string 字符数据 */
     function cdataHandler($xp, $cdata) {
     // does nothing here, but might e.g. print $cdata
     }
 } 

 $p = &new myParser();
 $result = $p->setInputFile('xml_parser_file.xml');
 $result = $p->parse();
 ?>

5.XML_Query2XML

实用query语句直接从数据库中调取数据并转换成XML(支持PDO, PEAR MDB2, PEAR DB, ADOdb)

 <?php
   require_once 'XML/Query2XML.php';
   $pdo = new PDO('mysql://root@localhost/Query2XML_Tests');
   $query2xml = XML_Query2XML::factory($pdo);
   $artistid = $_REQUEST['artistid'];
   $dom = $query2xml->getXML(
     array(
       'data' => array(
         ":$artistid"
       ),
       'query' => 'SELECT * FROM artist WHERE artistid = ?'
     ),
     array(
       'rootTag' => 'favorite_artist',
       'idColumn' => 'artistid',
       'rowTag' => 'artist',
       'elements' => array(
         'name',
         'birth_year',
         'music_genre' => 'genre'
       )
     )
   );
   header('Content-Type: application/xml');
   $dom->formatOutput = true;
   print $dom->saveXML();
 ?>

6.XML_RDDL

读取资源目录描述语言（Resource Directory Description Language，RDDL）

 <?php
 require_once "XML/RDDL.php";

 // create new RDDL parser
 $rddl   = &new XML_RDDL();

 // parse a document that contains RDDL resources
 $result = $rddl->parseRDDL('http://www.rddl.org');
 // check for error
 if (PEAR::isError($result)) {
   echo    sprintf( "ERROR: %s (code %d)", $result->getMessage(), $result->getCode());
   exit;
 }

 // get all resources
 $resources = $rddl->getAllResources();
 echo    "<pre>";
 print_r($resources);
 echo    "</pre>";

 //    get one resource by its Id
 $test = $rddl->getResourceById('CSS');
 echo    "<pre>";
 print_r($test);
 echo    "</pre>";

 // get all stylesheets
 $test = $rddl->getResourcesByNature('http://www.w3.org/1999/XSL/Transform');
 echo    "<pre>";
 print_r($test);
 echo    "</pre>";

 // get all normative references
 $test = $rddl->getResourcesByPurpose('http://www.rddl.org/purposes#normative-reference');
 echo    "<pre>";
 print_r($test);
 echo    "</pre>";
 ?>

7.XML_RSS

RSS解析器

 <?php
 require_once "XML/RSS.php";

 $rss =& new XML_RSS("http://rss.slashdot.org/Slashdot/slashdot");
 $rss->parse();

 echo "<h1>Headlines from <a href=\"http://slashdot.org\">Slashdot</a></h1>\n";
 echo "<ul>\n";

 foreach ($rss->getItems() as $item) {
     echo "<li><a href=\"" . $item['link'] . "\">" . $item['title'] . "</a></li>\n";
 }

 echo "</ul>\n";
 ?>

8.XML_Serializer

XML生成器

 <?php
 require_once 'XML/Serializer.php';

 $options = array(
     "indent"    => "    ",
     "linebreak" => "\n",
     "typeHints" => false,
     "addDecl"   => true,
     "encoding"  => "UTF-8",
     "rootName"   => "rdf:RDF",
     "defaultTagName" => "item"
 );

 $stories[] = array(
     'title'       => 'First Article',
     'link'        => 'http://freedomink.org/node/view/55',
     'description' => 'Short blurb about article........'
 );

 $stories[] = array(
     'title'       => 'Second Article',
     'link'        => 'http://freedomink.org/node/view/11',
     'description' => 'This article shows you how ......'
 );

 $data['channel'] = array(
     "title" => "Freedom Ink",
     "link"  => "http://freedomink.org/",
     $stories
 );

 $serializer = new XML_Serializer($options);

 if ($serializer->serialize($data)) {
     header('Content-type: text/xml');
     echo $serializer->getSerializedData();
 }
 ?>

9.XML_sql2xml

通过sql语句直接从数据库中调取数据转化成xml

 <?php
   require_once "XML/sql2xml.php";
   $sql2xmlclass = new xml_sql2xml("mysql://username:password@localhost/xmltest");
   $xmlstring = $sql2xmlclass->getxml("select * from bands");
 ?>

10.XML_Statistics

XML数据统计，标签个数，结构深度等，相当好用

 <?php
 require_once "XML/Statistics.php";
 $stat = new XML_Statistics(array("ignoreWhitespace" => true));
 $result = $stat->analyzeFile("example.xml");

 if ($stat->isError($result)) {
     die("Error: " . $result->getMessage());
 }

 // total amount of tags:
 echo "Total tags: " . $stat->countTag() . "<br />";

 // count amount of 'title' attribute, in all tags
 echo "Occurences of attribute title: " . $stat->countAttribute("title") . "<br />";

 // count amount of 'title' attribute, only in <section> tags
 echo "Occurences of attribute title in tag section: " . $stat->countAttribute("title", "section") . "<br />";

 // count total number of tags in depth 4
 echo "Amount of Tags in depth 4: " . $stat->countTagsInDepth(4) . "<br />";

 echo "Occurences of PHP Blocks: " . $stat->countPI("PHP") . "<br />";

 echo "Occurences of external entity 'bar': " . $stat->countExternalEntity("bar") . "<br />";

 echo "Data chunks: " . $stat->countDataChunks() . "<br />";

 echo "Length of all data chunks: " . $stat->getCDataLength() . "<br />";