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 . "
"; 
} 
$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>
";
echo "<ul>
";

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

echo "</ul>
";
?>

8.XML_Serializer

XML生成器

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

$options = array(
    "indent"    => "    ",
    "linebreak" => "
",
    "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 />";