[PHP] XML基礎簡單範例 - simplexml 函數 / asXml() 函數

死神

以下範例使用了PHP-XML基礎用法，不懂得可以告訴我再加以註解

1. <?php
   
2. $string = <<<XML
   
3. <?xml version='1.0'?>
   
4. <Item>
   
5.   <user>
   
6.     <title>TITLE</title>
   
7.     <name>Nick</name>
   
8.   </user>
   
9. </Item>
   
10. XML;
    
11. 
    
12. $xml = simplexml_load_string($string);
    
13. print_r($xml);
    
14. 
    
15. echo $obj->asXml();
    
16. $obj->asXml('example.xml');
    
17. ?>

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另一個範例，主要是注意Header使用，才能讓瀏覽器辨別

1. <?php
   
2. $newsXML = new SimpleXMLElement("<news></news>");
   
3. $newsXML->addAttribute('newsPagePrefix', 'value goes here');
   
4. $newsIntro = $newsXML->addChild('content');
   
5. $newsIntro->addAttribute('type', 'latest');
   
6. Header('Content-type: text/xml');
   
7. echo $newsXML->asXML();
   
8. ?>

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補充一個simpleXML大問題：CDATA封裝

這裡引用一段範例解決此問題：

1. <?php
   
2. // http://coffeerings.posterous.com/php-simplexml-and-cdata
   
3. class SimpleXMLExtended extends SimpleXMLElement {
   
4.   public function addCData($cdata_text) {
   
5.     $node = dom_import_simplexml($this);
   
6.     $no   = $node->ownerDocument;
   
7.     $node->appendChild($no->createCDATASection($cdata_text));
   
8.   }
   
9. }
   
10. 
    
11. $xmlFile    = 'config.xml';
    
12. // instead of $xml = new SimpleXMLElement('<site/>');
    
13. $xml        = new SimpleXMLExtended('<site/>');
    
14. $xml->title = NULL; // VERY IMPORTANT! We need a node where to append
    
15. $xml->title->addCData('Site Title');
    
16. $xml->title->addAttribute('lang', 'en');
    
17. $xml->saveXML($xmlFile);
    
18. ?>

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