//解析URL参数
function parseUrlParam($query){
    $queryArr = explode('&', $query);
    $params = array();
    if($queryArr[0] !== ''){
        foreach( $queryArr as $param ){
            list($name, $value) = explode('=', $param);
            $params[urldecode($name)] = urldecode($value);
        }       
    }
    return $params;
}

//设置URL参数数组
function setUrlParams($cparams, $url = ''){
  $parse_url = $url === '' ? parse_url($_SERVER["REQUEST_URI"]) : parse_url($url);
  $query = isset($parse_url['query']) ? $parse_url['query'] : '';
  $params = parseUrlParam($query);
  foreach( $cparams as $key => $value ){
    $params[$key] = $value;
  }
  return $parse_url['path'].'?'.http_build_query($params);
}

//获取URL参数
function getUrlParam($cparam, $url = ''){
    $parse_url = $url === '' ? parse_url($_SERVER["REQUEST_URI"]) : parse_url($url);
    $query = isset($parse_url['query']) ? $parse_url['query'] : '';
    $params = parseUrlParam($query);
    return isset($params[$cparam]) ? $params[$cparam] : '';
}