function drupal_path_alias_whitelist_rebuild

Rebuild the path alias white list.

Parameters

$source: An optional system path for which an alias is being inserted.

Return value

An array containing a white list of path aliases.

File

includes/path.inc, line 368

Code

function drupal_path_alias_whitelist_rebuild($source = NULL) {
    // When paths are inserted, only rebuild the whitelist if the system path
    // has a top level component which is not already in the whitelist.
    if (!empty($source)) {
        $whitelist = variable_get('path_alias_whitelist', NULL);
        if (isset($whitelist[strtok($source, '/')])) {
            return $whitelist;
        }
    }
    // For each alias in the database, get the top level component of the system
    // path it corresponds to. This is the portion of the path before the first
    // '/', if present, otherwise the whole path itself.
    $whitelist = array();
    $result = db_query("SELECT DISTINCT SUBSTRING_INDEX(source, '/', 1) AS path FROM {url_alias}");
    foreach ($result as $row) {
        $whitelist[$row->path] = TRUE;
    }
    variable_set('path_alias_whitelist', $whitelist);
    return $whitelist;
}