Drupal的配置文件搜索是通过bootstrap.inc的conf_path()函数实现的：
function conf_path($require_settings = TRUE, $reset = FALSE) {
$conf = &drupal_static(__FUNCTION__, '');
if ($conf && !$reset) {
return $conf;
}
$confdir = 'sites';
$sites = array();
if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/sites.php')) {
// This will overwrite $sites with the desired mappings.
include(DRUPAL_ROOT . '/' . $confdir . '/sites.php');
}
$uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
$server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
for ($i = count($uri) - 1; $i > 0; $i--) {
for ($j = count($server); $j > 0; $j--) {
$dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
if (isset($sites[$dir]) && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $sites[$dir])) {
$dir = $sites[$dir];
}
if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir . '/settings.php') || (!$require_settings && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir))) {
$conf = "$confdir/$dir";
return $conf;
}
}
}
$conf = "$confdir/default";
return $conf;
}
例如，对网址http://www.drupal.org:8080/mysite/test/的访问，Drupal会安装下面的顺序搜索配置文件：
sites/8080.www.drupal.org.mysite.test
sites/www.drupal.org.mysite.test
sites/drupal.org.mysite.test
sites/org.mysite.test sites/8080.www.drupal.org.mysite
sites/www.drupal.org.mysite
sites/drupal.org.mysite
sites/org.mysite sites/8080.www.drupal.org
sites/www.drupal.org
sites/drupal.org
sites/org sites/default
sites/sites.php可以为站点设置别名。例如可以把访问http://www.drupal.org:8080/mysite/test/的配置文件重定向到example.com/settings.php：
$sites['8080.www.drupal.org.mysite.test'] = 'example.com';
参考：