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:

  

复制代码 代码如下:

  <?php

  //Creates XML string and XML document using the DOM

  $dom = new DomDocument('1.0');

  //add root - <books>

  $books = $dom->appendChild($dom->createElement_x_x ('books'));

  //add <book> element to <books>

  $book = $books->appendChild($dom->createElement_x_x ('book'));

  //add <title> element to <book>

  $title = $book->appendChild($dom->createElement_x_x ('title'));

  //add <title> text node element to <title>

  $title->appendChild($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:

  

复制代码 代码如下:

  $aa = "111";

  $xmlstr = <<<XML

  <?xml version='1.0'?>

  <document>

  <title>{$aa}</title>

  <from>Joe</from>

  <to>Jane</to>

  <body>

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

  </body>

  </document>

  XML;

  $dom = new domDocument;

  $dom->loadXML($xmlstr);

  $test1 = $dom->saveXML();

  $dom->save('test1.xml');

  实例三:

  test1.xml:

  

复制代码 代码如下:

  <?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>

  example.php:

  

复制代码 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:

  

复制代码 代码如下:

  <?

  $xmlstr = <<<XML

  <?xml version='1.0' standalone='yes'?>

  <books>

  <book>

  <title>Great American Novel</title>

  <characters>

  <character>

  <name>Cliff</name>

  <desc>really great guy</desc>

  </character>

  <character>

  <name>Lovely Woman</name>

  <desc>matchless beauty</desc>

  </character>

  <character>

  <name>Loyal Dog</name>

  <desc>sleepy</desc>

  </character>

  </characters>

  <plot>

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

  at mailman.

  </plot>

  <success type='bestseller'>4</success>

  <success type='bookclubs'>9</success>

  </book>

  </books>

  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<br>';

  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:

  

复制代码 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:

  

复制代码 代码如下:

  <?php

  $sxe = simplexml_load_string('<books><book><title>Great American

  Novel</title></book></books>');

  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:

  

复制代码 代码如下:

  <?php

  $dom = new domDocument;

  $dom->loadXML('<books><book><title>Great American

  Novel</title></book></books>');

  if (!$dom) {

  echo 'Error while parsing the document';

  exit;

  }

  $s = simplexml_import_dom($dom);

  echo $s->book[0]->title; // Great American Novel

  ?>