PHP: XML Nodes help functions

PHP: XML Nodes help functions

function replaceNode(&$srcNode, &$dstNode,&$xmlDoc)
{
	$newNode = $xmlDoc->importNode($srcNode, true);
	$dstNode->parentNode->replaceChild($newNode,$dstNode);
}

function importNode(&$newNode, &$refNode,&$xmlDoc)
{
	if ($newNode->childNodes)
	foreach ($newNode->childNodes as $child)
	{
		$newNode2 = $xmlDoc->importNode($child, true);
		insertNode($newNode2, $refNode, 'inside');
	}
}

function removeChildren(&$node) 
{
	while ($node->firstChild) 
	{
		while ($node->firstChild->firstChild) 
		{
			removeChildren($node->firstChild);
		}
		$node->removeChild($node->firstChild);
	}
}

function removeNode(&$node)
{
	removeChildren($node);
	$node->parentNode->removeChild($node);	
}

function insertNode(&$newNode, &$refNode, $insertMode='inside') 
{
	if(!$insertMode || $insertMode == "inside") 
	{
	/*	$found=false;
		foreach ($refNode->childNodes as $child)
		{
			if ($newNode->tagName == $child->tagName)
				$refNode->removeChild($child);
		}
		
		if ($found)
			return;
*/			
		$refNode->appendChild($newNode);
	} 
	else if($insertMode == "before") 
	{
	   
		$refNode->parentNode->insertBefore($newNode, $refNode);
	   
	} 
	else if($insertMode == "after") 
	{
	   
		if($refNode->nextSibling) {
			$refNode->parentNode->insertBefore($newNode, $refNode->nextSibling);
		} else {
			$refNode->parentNode->appendChild($newNode);
		}     
	}
}



class XmlUtils
{
	public static function removeChildren(&$node) 
	{
  		while ($node->firstChild) 
  		{
    		while ($node->firstChild->firstChild) 
    		{
      			XmlUtils::removeChildren($node->firstChild);
    		}
    		$node->removeChild($node->firstChild);
  		}
	}
	
	public static function insertNode($newNode, $refNode, $insertMode=null) 
    {
        if(!$insertMode || $insertMode == "inside") 
        {
           
            $refNode->appendChild($newNode);
           
        } 
        else if($insertMode == "before") 
        {
           
            $refNode->parentNode->insertBefore($newNode, $refNode);
           
        } 
        else if($insertMode == "after") 
        {
           
            if($refNode->nextSibling) {
                $refNode->parentNode->insertBefore($newNode, $refNode->nextSibling);
            } else {
                $refNode->parentNode->appendChild($newNode);
            }     
                 
        }
    }
	
	public static function addTagWithTabs(&$str, $value, $level=0) 
	{
		if (is_array($level))
			$level=count($level);
		
		$level=$level+1;
		
		//$str.=str_repeat(CHR(9),$level).$value.CHR(10);
		$str .= str_repeat ( "    ", $level ) . $value . CHR ( 10 );
	}

	public static function printXml($xmlStr) 
	{
		print_r ( "<pre>" . htmlentities ( $xmlStr ) . "</pre>" );
	}

	
	public static function getElementById(&$nodeRoot, &$xmlDoc, $id)
	{
		$value=$nodeRoot->getAttribute("id");
	
	   	if ($nodeRoot->hasAttribute("id") && (!strcmp($value,$id)))
	   	{
	   		return $nodeRoot;
	   	}
	
	    if ($nodeRoot->hasChildNodes())
	    {
	    	foreach($nodeRoot->childNodes as $child)
	    	{
				if (get_class($child)=='DOMElement')
	    		{
	    			$node=XmlUtils::getElementById($child,$xmlDoc,$id);
	    			if ($node!=NULL)
	    				return $node;	
	    		}
	    	}
	    }
	    return NULL;
	}
}