用PHP编写和读取XML的几种方式

            一.使用DOM生成和读取XML文件
实例一：
[U]复制代码[/U] 代码如下:
appendChild($dom->createElement_x_x ('books'));
//add element to
$book = $books->appendChild($dom->createElement_x_x ('book'));
//add  element to
$title = $book->appendChild($dom->createElement_x_x ('title'));
//add  text node element to  
$title->appendChild($dom->createTextNode('Great American Novel'));
//generate xml
$dom->formatOutput = true; // set the formatOutput attribute of domDocument to true
//save XML as string or file
$test1 = $dom->saveXML(); // put string in test1
$dom -> save('test1.xml'); // save as file
?>

实例二：
[U]复制代码[/U] 代码如下:
$aa = "111";
$xmlstr =  

{$aa}
Joe
Jane

I know that's the answer -- but what's the question?


XML;
$dom = new domDocument;
$dom->loadXML($xmlstr);
$test1 = $dom->saveXML();
$dom->save('test1.xml');

实例三：
test1.xml:
[U]复制代码[/U] 代码如下:



Jack Herrington
PHP Hacks
O'Reilly


Jack Herrington
Podcasting Hacks
O'Reilly



example.php:
[U]复制代码[/U] 代码如下:
$doc = new DOMDocument();
$doc->load('test1.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";
}

二.使用simple生成和读取xml文件
实例一：
[U]复制代码[/U] 代码如下:



Great American Novel


Cliff
really great guy


Lovely Woman
matchless beauty


Loyal Dog
sleepy



Cliff meets Lovely Woman. Loyal Dog sleeps, but wakes up to bark
at mailman.

4
9


XML;
//提取节点内容
$xml = new SimpleXMLElement($xmlstr);
foreach ($xml->book[0]->success as $success) {
switch((string) $success['type']) { // Get attributes as element indices
case 'bestseller':
echo $success. ' months on bestseller list
';
break;
case 'bookclubs':
echo $success. ' bookclub listings';
break;
}
}
//修改文本节点内容
$xml = new SimpleXMLElement($xmlstr);
$xml->book[0]->characters->character[0]->name = 'Big Cliff';
echo $xml->asXML();
//添加子元素的文本节点
$xml = new SimpleXMLElement($xmlstr);
$character = $xml->book[0]->characters->addChild('character');
$character->addChild('name', 'Yellow Cat');
$character->addChild('desc', 'aloof');
$success = $xml->book[0]->addChild('success', '2');
$success->addAttribute('type', 'reprints');
echo $xml->asXML();
?>

实例二：
[U]复制代码[/U] 代码如下:
if (file_exists('test1.xml')) { //读取xml文件
$xml = simplexml_load_file('test1.xml');
var_dump(xml);
} else {
exit('Failed to open test1.xml.');
}

三.DOM和simple互操作
DOM导入simpleXML：
[U]复制代码[/U] 代码如下:
Great American
Novel');
if ($sxe === false) {
echo 'Error while parsing the document';
exit;
}
$dom_sxe = dom_import_simplexml($sxe);
if (!$dom_sxe) {
echo 'Error while converting XML';
exit;
}
$dom = new DOMDocument('1.0');
$dom_sxe = $dom->importNode($dom_sxe, true);
$dom_sxe = $dom->appendChild($dom_sxe);
$test2 = $dom->saveXML(); // put string in test2
$dom -> save('test2.xml'); // save as file
?>

simpleXML导入DOM：
[U]复制代码[/U] 代码如下:
loadXML('Great American
Novel');
if (!$dom) {
echo 'Error while parsing the document';
exit;
}
$s = simplexml_import_dom($dom);
echo $s->book[0]->title; // Great American Novel
?>
            
            
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