php xml 转array 函数 （原创）

/**
     *Author zhudongchang
     *Date 2015/6/12    原创
     *xml 转array 函数
     *@param string $xmlStr xml字符串
     *@return string
     */
    public static function convertXmlToArray($xmlStr){
        $patten=<<<EOT
/(^\s*<(\s*[a-zA-Z0-9_='":]+\s*)+>.*<\s*\/(\s*[a-zA-Z0-9_='":]+\s*)+>\s*$)|(^\s*<(\s*[a-zA-Z0-9_='":]+\s*)+\/\s*>$)/s
EOT;
        $pattenChildXml=<<<EOT
/^\s*<(\s*[a-zA-Z0-9_='":]+\s*)+>(.*)<\s*\/(\s*[a-zA-Z0-9_='":]+\s*)+>\s*$/s
EOT;
        $res=array();
        $xml = simplexml_load_string($xmlStr);
        foreach($xml->children() as $val){
            $key=$val->getName();
            $valXml=$val->asXML();
            preg_match($pattenChildXml,$valXml,$match);
            $childXmlStr=$match[2];
            //var_dump($match,$valXml,$childXmlStr);die();
            $temp=preg_match($patten,$childXmlStr)?self::convertXmlToArray($valXml):(string)$val;
            if(array_key_exists($key,$res)){
                is_array($res[$key]) or $res[$key]=array($res[$key]);
                $tempNew=array();
                foreach($res[$key] as $k =>$v){
                    if(!is_int($k)){
                        $tempNew[]=$v;
                        unset($res[$key][$k]);
                    }
                }
                empty($tempNew) or $res[$key][]=$tempNew;
                $res[$key][]=$temp;
            }else{
                $res[$key]=$temp;
            }
        }
        return $res;
    }