/**
* 返回不包含任何查询参数的 URI（但包含脚本名称）
*
* 几个示例：
*
* <ul>
* <li>请求 http://www.example.com/index.php?controller=posts&action=create</li>
* <li>返回 /index.php</li>
* </ul>
* <ul>
* <li>请求 http://www.example.com/news/index.php?controller=posts&action=create</li>
* <li>返回 /news/index.php</li>
* </ul>
* <ul>
* <li>请求 http://www.example.com/index.php/posts/create</li>
* <li>返回 /index.php</li>
* </ul>
* <ul>
* <li>请求 http://www.example.com/news/show/id/1</li>
* <li>返回 /news/show/id/1</li>
* <li>假设使用了 URL 重写，并且 index.php 位于根目录</li>
* </ul>
*
* 此方法参考 Zend Framework 实现。
*
* @return string 请求 URL 中不包含查询参数的部分
*/
function baseUri()
{
if (self::$_base_uri) {
return self::$_base_uri;
}
$filename = basename($_SERVER['SCRIPT_FILENAME']);
if (basename($_SERVER['SCRIPT_NAME']) === $filename) {
$url = $_SERVER['SCRIPT_NAME'];
} elseif (basename($_SERVER['PHP_SELF']) === $filename) {
$url = $_SERVER['PHP_SELF'];
} elseif (isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME']) === $filename) {
$url = $_SERVER['ORIG_SCRIPT_NAME'];
// 1and1 shared hosting compatibility
} else {
// Backtrack up the script_filename to find the portion matching
// php_self
$path = $_SERVER['PHP_SELF'];
$segs = explode('/', trim($_SERVER['SCRIPT_FILENAME'], '/'));
$segs = array_reverse($segs);
$index = 0;
$last = count($segs);
$url = '';
do {
$seg = $segs[$index];
$url = '/' . $seg . $url;
++$index;
} while ($last > $index && false !== ($pos = strpos($path, $url)) && 0 != $pos);
}
// Does the baseUrl have anything in common with the request_uri?
$request_uri = $this->requestUri();
if (0 === strpos($request_uri, $url)) {
// full $url matches
self::$_base_uri = $url;
return self::$_base_uri;
}
if (0 === strpos($request_uri, dirname($url))) {
// directory portion of $url matches
self::$_base_uri = rtrim(dirname($url), '/') . '/';
return self::$_base_uri;
}
if (!strpos($request_uri, basename($url))) {
// no match whatsoever; set it blank
return '';
}
// If using mod_rewrite or ISAPI_Rewrite strip the script filename
// out of baseUrl. $pos !== 0 makes sure it is not matching a value
// from PATH_INFO or QUERY_STRING
if (strlen($request_uri) >= strlen($url) && (false !== ($pos = strpos($request_uri, $url)) && $pos !== 0)) {
$url = substr($request_uri, 0, $pos + strlen($url));
}
self::$_base_uri = rtrim($url, '/') . '/';
return self::$_base_uri;
}
