PHP基于dom实现XML数据格式的操作：

1、读取xml格式数据方法

2、数据保存为xml格式方法

【1、读取xml格式数据方法】

方法源码：

<?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";
    }
?>

xml文件内容：

<?xml version="1.0"?>
<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>

运行结果如下：

PHP Hacks - Jack Herrington - O'Reilly

Podcasting Hacks - Jack Herrington - O'Reilly

【2、数据保存为xml格式方法】

<?php
    $books = array();
    $books [] = array(
        'title' => 'PHP Hacks',
        'author' => 'Jack Herrington',
        'publisher' => "O'Reilly"
    );
    $books [] = array(
        'title' => 'Podcasting Hacks',
        'author' => 'Jack Herrington',
        'publisher' => "O'Reilly"
    );
    $doc = new DOMDocument();
    $doc->formatOutput = true;
    $r = $doc->createElement( "books" );
    $doc->appendChild( $r );
    foreach( $books as $book ){
        $b = $doc->createElement( "book" );
        $author = $doc->createElement( "author" );
        $author->appendChild(
            $doc->createTextNode( $book['author'] )
        );
        $b->appendChild( $author );
        $title = $doc->createElement( "title" );
        $title->appendChild(
            $doc->createTextNode( $book['title'] )
        );
        $b->appendChild( $title );
        $publisher = $doc->createElement( "publisher" );
        $publisher->appendChild(
            $doc->createTextNode( $book['publisher'] )
        );
        $b->appendChild( $publisher );
        $r->appendChild( $b );
    }
    echo $doc->saveXML();
?>

运行结果：

<?xml version="1.0"?>

<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>

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