php xml(转)

简单读取XML的方法 

<?xml version="1.0" encoding="gb2312"?>
<xml>
<site>
<part id="1">
<title id="a">czbin xml版块</title>
<describe>xml的相关文章</describe>
</part>
<part id="2">
<title id="b">czbin php版块</title>
<describe>php的相关文章</describe>
</part>
<part id="3">
<title id="c">czbin ajax版块</title>
<describe>ajax的相关文章</describe>
</part>
</site>
</xml>

<?php
$xml = simplexml_load_file('sxml.xml');
$part = $xml->site->part;
foreach ( $part as $content )
{
echo $content['id']."<br />";
echo $content->title."<br />";
echo $content->title['id']."<br />";
echo $content->describe."<br />";
}
?>

输出结果： 

1
czbin xml版块
a
xml的相关文章
2
czbin php版块
b
php的相关文章
3
czbin ajax版块
c
ajax的相关文章

DOM读取 

<?xml version="1.0" encoding="gb2312"?>
<xml>
<main>
<list>1</list>
<list>2</list>
<list>3</list>
</main>
<main>
<list>4</list>
<list>5</list>
<list>6</list>
</main>
<m>
<list>7</list>
<list>8</list>
<list>9</list>
</m>
</xml>

<?php
$xml = new DOMDocument();
$xml->load('cy.xml');
$main = $xml->getElementsByTagName('main');
foreach( $main as $main)
{
    $list = $main->getElementsByTagName( "list" );
    foreach ( $list as $list )
    {
        $value = $list->firstChild->nodeValue;
        echo $value."<br />";
    }
}
$m = $xml->getElementsByTagName('m');
foreach( $m as $m)
{
    $list = $m->getElementsByTagName( "list" );
    foreach ( $list as $list )
    {
        $value = $list->firstChild->nodeValue;
        echo $value."<br />";
    }
}
?>

<?xml version="1.0" encoding="gb2312"?>
<LevelOne>
<LevelTwo>
<LevelThree id="1">This is Text One</LevelThree>
<LevelThree id="2">This is Text Two</LevelThree>
<LevelThree id="3">This is Text Three</LevelThree>
</LevelTwo>
<LevelTwo>
<LevelThree id="4">This is Text Four</LevelThree>
<LevelThree id="5">This is Text Five</LevelThree>
<LevelThree id="6">This is Text Six</LevelThree>
</LevelTwo>
</LevelOne>

<?php
$xml = new DOMDocument(); //建立一个DOMDocument
$xml->load('cy.xml'); //Php指定需要读取xml文件的位置
$LevelOne = $xml->getElementsByTagName('LevelOne');//按照名称取得节点，返回所有节点的集合,不过这里这样读LevelOne是没有意义的....
$LevelOne = $xml->getElementsByTagName('LevelOne')->item(0);//返回第一个LevelOne节点中的内容
$LevelTwo = $LevelOne->getElementsByTagName('LevelTwo'); //按照名称取得节点,返回所有LevelTwo
foreach ( $LevelTwo as $Content )//循环读出所有LevelTwo，并在循环里，把LevelTwo用Content表示
{
    $LevelThree = $Content->getElementsByTagName('LevelThree');//返回所有LevelThree
    foreach ( $LevelThree as $Concert )
    {
        $name = $Concert->nodeName;//节点名称
        $value = $Concert->nodeValue;//节点值
        $id = $Concert->getAttribute('id');//"id"属性值
        echo $name."<br />";
        echo $value."<br />";
        echo $id."<br />";
    }
}
?>

$main=$doc->getElementsByTagName('main'); 返回的是一个集合 需要foreach遍历 
$main=$doc->getElementsByTagName('main')->item(0) 返回的是一个具体的节点 如果有多个<main></main>返回第一个 
$name=$title->nodeName; //节点名 title、list等 
$value=$title->nodeValue; //节点值 

http://www.ibm.com/developerworks/cn/opensource/os-xmldomphp/ 

<books>
  <book>
  <author>Jack Herrington</author>
  <title>PHP Hacks</title>
  <publisher>O'Reilly</publisher>
  </book>
  <book>
  <author>Jack Herrington</author>
  <title>Podcasting Hacks</title>
  <publisher>O'Reilly</publisher>
  </book>
  </books>

<?php
  $doc = new DOMDocument();
  $doc->load( 'books.xml' );

  $books = $doc->getElementsByTagName( "book" );
  foreach( $books as $book )
  {
  $authors = $book->getElementsByTagName( "author" );
  $author = $authors->item(0)->nodeValue;

  $publishers = $book->getElementsByTagName( "publisher" );
  $publisher = $publishers->item(0)->nodeValue;

  $titles = $book->getElementsByTagName( "title" );
  $title = $titles->item(0)->nodeValue;

  echo "$title - $author - $publisher\n";
  }
  ?>

  对数据进行解析是应用开发必不可少的一个环节。下面是使用XML Parser对XML文档进行解析的过程：

<?php
// 处理开始元素函数
function startElementHandler($parser, $element, $attributes) {
    echo "元素开始：".$element."<br>";
    if($attributes) {
        echo "属性：";
        foreach ( $attributes as $key => $value ) {
            echo $key."=".$value." ";
        }
        echo "<br>";
    }
}

// 处理结束元素函数
function endElementHandler($parser, $element) {
    echo "元素结束：".$element."<br><br>";
}

// 处理字符串数据函数
function characterDataHandler($parser, $data) {
    if(trim($data)) {
        echo "字符串数据：".htmlspecialchars($data)."<br>";
    }
}

// 处理解析错误函数
function parserError($parser) {
    $code = xml_get_error_code($parser);
    $error = xml_error_string($code);
    $errorColumn = xml_get_current_column_number($parser);
    $errorLine = xml_get_current_line_number($parser);
    return "错误代码：".$code." 错误：".$error."在第".$errorLine."行第".$errorColumn."列";
}

// 创建解析器
$parser = xml_parser_create();

// 注册元素处理函数
xml_set_element_handler($parser, "startElementHandler", "endElementHandler");
xml_set_character_data_handler($parser, "characterDataHandler");

// 获取文件内容
$xml = file_get_contents("parser.xml");

// 开始解析parser.xml文档，解析错误就调用错误处理函数
xml_parse($parser, $xml) or die(parserError());

// 删除解析器并释放内存
xml_parser_free($parser);

?>

    我们给定的XML示例是：

<?xml version="1.0" encoding="UTF-8"?>
<phpedu>
    <title>PHP100</title>
    <item type="text" name="item">
        <contents type="text">PHP</contents>
        <contents>SQL</contents>
        <contents>Linux</contents>
        <contents>Apache</contents>
    </item>
    <address type="URL">www.php100.com</address>
</phpedu>

    多说一句：希望对您有所帮助！不同语言对XML的解析区别于形式，统一于本质！：）