/**
* 返回包含由客户端提供的、跟在真实脚本名称之后并且在查询语句（query string）之前的路径信息
*
* <pre>Example:
* 请求: http://www.tintsoft.com/example/index.php?a=test
* 返回: a=test
* </pre>
*
* @throws Base_Exception
*/
private static function _init_path_info()
{
$request_uri = self::get_request_uri();
$script_url = self::get_script_url();
$base_url = self::get_base_url();
if (strpos($request_uri, $script_url) === 0) {
$path_info = substr($request_uri, strlen($script_url));
} elseif ($base_url === '' || strpos($request_uri, $base_url) === 0) {
$path_info = substr($request_uri, strlen($base_url));
} elseif (strpos($_SERVER['PHP_SELF'], $script_url) === 0) {
$path_info = substr($_SERVER['PHP_SELF'], strlen($script_url));
} else {
throw new Base_Exception('[Base.Base_Request._init_path_info] determine the entry path info failed!!');
}
// if (($pos = strpos ( $path_info, '?' )) !== false) $path_info =
// substr ( $path_info, $pos + 1 );
self::$_path_info = trim($path_info, '/');
}
