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/**
* 获取站点根目录 URL
*
* @return string
*/
function base_url()
{
$clean_url = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : NULL;
$clean_url = dirname(substr($_SERVER['PHP_SELF'], 0, strlen($_SERVER['PHP_SELF']) - strlen($clean_url)));
$clean_url = rtrim($_SERVER['HTTP_HOST'] . $clean_url, '/\\');
if ((isset($_SERVER['HTTPS']) AND !in_array(strtolower($_SERVER['HTTPS']), array('off', 'no', 'false', 'disabled'))) OR $_SERVER['SERVER_PORT'] == 443)
{
$scheme = 'https';
}
else
{
$scheme = 'http';
}
return $scheme . '://' . $clean_url;
} 
