再来一个数组转XML-PHP源码

saveXML();
 */

class Array2XML {

    private static $xml = null;
    private static $encoding = &＃39;UTF-8&＃39;;

    /**
     * Initialize the root XML node [optional]
     * @param $version
     * @param $encoding
     * @param $format_output
     */
    public static function init($version = &＃39;1.0&＃39;, $encoding = &＃39;UTF-8&＃39;, $format_output = true) {
        self::$xml = new DomDocument($version, $encoding);
        self::$xml->formatOutput = $format_output;
        self::$encoding = $encoding;
    }

    /**
     * Convert an Array to XML
     * @param string $node_name - name of the root node to be converted
     * @param array $arr - aray to be converterd
     * @return DomDocument
     */
    public static function &createXML($node_name, $arr=array()) {
    $xml = self::getXMLRoot();
    $xml->appendChild(self::convert($node_name, $arr));

    self::$xml = null;    // clear the xml node in the class for 2nd time use.
    return $xml;
    }

    /**
     * Convert an Array to XML
     * @param string $node_name - name of the root node to be converted
     * @param array $arr - aray to be converterd
     * @return DOMNode
     */
    private static function &convert($node_name, $arr=array()) {

    //print_arr($node_name);
    $xml = self::getXMLRoot();
    $node = $xml->createElement($node_name);

    if(is_array($arr)){
        // get the attributes first.;
        if(isset($arr[&＃39;@attributes&＃39;])) {
            foreach($arr[&＃39;@attributes&＃39;] as $key => $value) {
                if(!self::isValidTagName($key)) {
                    throw new Exception(&＃39;[Array2XML] Illegal character in attribute name. attribute: &＃39;.$key.&＃39; in node: &＃39;.$node_name);
                }
                $node->setAttribute($key, self::bool2str($value));
            }
            unset($arr[&＃39;@attributes&＃39;]); //remove the key from the array once done.
        }

        // check if it has a value stored in @value, if yes store the value and return
        // else check if its directly stored as string
        if(isset($arr[&＃39;@value&＃39;])) {
            $node->appendChild($xml->createTextNode(self::bool2str($arr[&＃39;@value&＃39;])));
            unset($arr[&＃39;@value&＃39;]);    //remove the key from the array once done.
            //return from recursion, as a note with value cannot have child nodes.
            return $node;
        } else if(isset($arr[&＃39;@cdata&＃39;])) {
            $node->appendChild($xml->createCDATASection(self::bool2str($arr[&＃39;@cdata&＃39;])));
            unset($arr[&＃39;@cdata&＃39;]);    //remove the key from the array once done.
            //return from recursion, as a note with cdata cannot have child nodes.
            return $node;
        }
    }

    //create subnodes using recursion
    if(is_array($arr)){
        // recurse to get the node for that key
        foreach($arr as $key=>$value){
            if(!self::isValidTagName($key)) {
                throw new Exception(&＃39;[Array2XML] Illegal character in tag name. tag: &＃39;.$key.&＃39; in node: &＃39;.$node_name);
            }
            if(is_array($value) && is_numeric(key($value))) {
                // MORE THAN ONE NODE OF ITS KIND;
                // if the new array is numeric index, means it is array of nodes of the same kind
                // it should follow the parent key name
                foreach($value as $k=>$v){
                    $node->appendChild(self::convert($key, $v));
                }
            } else {
                // ONLY ONE NODE OF ITS KIND
                $node->appendChild(self::convert($key, $value));
            }
            unset($arr[$key]); //remove the key from the array once done.
        }
    }

    // after we are done with all the keys in the array (if it is one)
    // we check if it has any text value, if yes, append it.
    if(!is_array($arr)) {
        $node->appendChild($xml->createTextNode(self::bool2str($arr)));
    }

    return $node;
    }

    /*
     * Get the root XML node, if there isn&＃39;t one, create it.
     */
    private static function getXMLRoot(){
        if(empty(self::$xml)) {
            self::init();
        }
        return self::$xml;
    }

    /*
     * Get string representation of boolean value
     */
    private static function bool2str($v){
        //convert boolean to text value.
        $v = $v === true ? &＃39;true&＃39; : $v;
        $v = $v === false ? &＃39;false&＃39; : $v;
        return $v;
    }

    /*
     * Check if the tag name or attribute name contains illegal characters
     * Ref: http://www.w3.org/TR/xml/#sec-common-syn
     */
    private static function isValidTagName($tag){
        $pattern = &＃39;/^[a-z_]+[a-z0-9\:\-\.\_]*[^:]*$/i&＃39;;
        return preg_match($pattern, $tag, $matches) && $matches[0] == $tag;
    }
}
?>