array2xml

<?php 
class ArrayToXML
{

    /**
     
     * The main function for converting to an XML document.
     
     * Pass in a multi dimensional array and this recrusively loops through and builds up an XML document.
     
     *
     
     * @param array $data
     
     * @param string $rootNodeName - what you want the root node to be - defaultsto data.
     
     * @param SimpleXMLElement $xml - should only be used recursively
     
     * @return string XML
     
     */
     
    public static function toXml($data, $rootNodeName = 'data', $xml = null)
    {
    
        // turn off compatibility mode as simple xml throws a wobbly if you don't.
        
        if (ini_get('zend.ze1_compatibility_mode') == 1)
        {
        
            ini_set('zend.ze1_compatibility_mode', 0);
            
        }

        
        if ($xml == null)
        {
        
            $xml = simplexml_load_string("<?xml version='1.0' encoding='utf-8'?><$rootNodeName />");
            
        }

        
        // loop through the data passed in.
        
        foreach ($data as $key=>$value)
        {
        
            // no numeric keys in our xml please!
            
            if (is_numeric($key))
            {
            
                // make string key...
                
                $key = "unknownNode_".(string) $key;
                
            }

            
            // replace anything not alpha numeric
            
            $key = preg_replace('/[^a-z]/i', '', $key);

            
            // if there is another array found recrusively call this function
            
            if (is_array($value))
            {
            
                $node = $xml->addChild($key);
                
                // recrusive call.
                
                ArrayToXML::toXml($value, $rootNodeName, $node);
                
            }
            else
            {
            
                // add single node.
                
                $value = htmlentities($value,ENT_QUOTES,"UTF-8");
                
                $xml->addChild($key, $value);
                
            }

            
        }
        
        // pass back as string. or simple xml object if you want!
        
        return $xml->asXML();
        
    }
    
}
?>