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11/30/2007 at 07:57AM PST, ID: 22993323

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8.4

Merging XML in PHP using SimpleXML and DOM

Asked by TruthHunter in PHP Scripting Language, Extensible Markup Language (XML), Web Development

Tags: php, merge, xml, simplexml

Hi,

I'm having trouble trying to merge two SimpleXML objects (user preference settings) in PHP. It should be simple enough - the objects have the same root element, and I simply want to merge at the top child level. However, the code I'm providing here, while it executes, does not work. At the end of the merge() function, the merged preferences are empty.

I would very much appreciate if someone could tell me what I'm doing wrong or suggest another approach. Maximum points because I need a solution pretty quickly. Thanks very much!

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             Example of desired XML result:
 
Before merge:
 
Old:
<xml version="1.0"/>
<preferences>
<setting1>value1</setting1>
<setting2 attr21="attr21Value" attr22="attr22Value" attr23="attr23Value"/>
</preferences>
 
New:
<xml version="1.0"/>
<preferences>
<setting1>value2</setting1>
<setting3 attr31="attrValue31" attr32="attr32Value" attr33="attrValue33"><setting31>value31</setting31><setting32>value32</setting32></setting3>
</preferences>
 
After merge:
<xml version="1.0"/>
<preferences>
<setting1>value2</setting1>
<setting2 attr21="attr21Value" attr22="attr22Value" attr23="attr23Value"/>
<setting3 attr31="attrValue31" attr32="attr32Value" attr33="attrValue33"><setting31>value31</setting31><setting32>value32</setting32></setting3>
</preferences>
 
-------------------
 
class UserPreferences
{
	const DEFAULT_STRING = "<preferences/>";
 
	$m_preferences = null;
 
	public function __construct()
	{
		$this->m_preferences = new SimpleXMLElement(self::DEFAULT_STRING);
	}
 
	// $new is a SimpleXMLElement containing the preferences to be merged
	public function merge($new)
	{
		$mergedDom = DOMDocument::loadXML(self::DEFAULT_STRING);
 
		$oldDom = DOMDocument::loadXML($this->m_preferences->asXML());
 
		// Compare existing/old preferences with the new
		// preferences.  If a match is found, delete the
		// old preference.
		foreach ($new->children() as $newChild)
		{
			$i = 0;
 
			foreach ($this->m_preferences->children() as $oldChild)
			{
				if ($newChild->asXML() == $oldChild->asXML())
				{
					$oldDom->documentElement->removeChild($oldDom->documentElement->childNodes->item($i));
					$i--;
				}
				else
				{
					$i++;
				}
			}
 
			$newChildDom = DOMDocument::loadXML($newChild->asXML());
			$mergedDom->documentElement->appendChild($mergedDom->importNode($newChildDom, true));
		}
 
		$this->m_preferences = simplexml_import_dom($oldDom);
 
		foreach ($this->m_preferences->children() as $oldChild)
		{
			$oldChildDom = DOMDocument::loadXML($oldChild->asXML());
			$mergedDom->documentElement->appendChild($mergedDom->importNode($oldChildDom, true));
		}
 
		$this->m_preferences = simplexml_import_dom($mergedDom);
	}
}

           
         

Keywords: Merging XML in PHP using SimpleXML a…

	Title
1	merging 2 xml documents in PHP

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20091111-EE-VQP-91 / EE_QW_2_20070628

Merging XML in PHP using SimpleXML and DOM

Asked by TruthHunter in PHP Scripting Language, Extensible Markup Language (XML), Web Development

Tags: php, merge, xml, simplexml

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