用PHP编写和读取XML的几种方式_php技巧

//Creates XML string and XML document using the DOM 
$dom = new DomDocument('1.0'); 
//add root -  
$books = $dom->appendChild($dom->createElement_x_x ('books')); 
//add  element to  
$book = $books->appendChild($dom->createElement_x_x ('book')); 
//add  
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: 
 代码如下:

 
 
 
Jack Herrington 
 
O'Reilly 
 
 
Jack Herrington 
 
O'Reilly 
 
 
 

example.php: 
 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： 
 代码如下:

$xmlstr = << 
 
 
 
 
 
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： 
 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： 
 代码如下:

$sxe = simplexml_load_string(''); 
if ($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： 
 代码如下:

$dom = new domDocument; 
$dom->loadXML(''); 
if (!$dom) { 
echo 'Error while parsing the document'; 
exit; 
} 
$s = simplexml_import_dom($dom); 
echo $s->book[0]->title; // Great American Novel 
?>