function drupal_lookup_path in Drupal 4

Same name and namespace in other branches

1. 5 includes/path.inc \drupal_lookup_path()
2. 6 includes/path.inc \drupal_lookup_path()
3. 7 includes/path.inc \drupal_lookup_path()

Given an alias, return its Drupal system URL if one exists. Given a Drupal system URL return its alias if one exists.

Parameters

$action: One of the following values:

• wipe: delete the alias cache.
• alias: return an alias for a given Drupal system path (if one exists).
• source: return the Drupal system URL for a path alias (if one exists).

$path: The path to investigate for corresponding aliases or system URLs.

Return value

Either a Drupal system path, an aliased path, or FALSE if no path was found.

3 calls to drupal_lookup_path()

drupal_clear_path_cache in includes/common.inc

Reset the static variable which holds the aliases mapped for this request.

drupal_get_normal_path in includes/path.inc

Given a path alias, return the internal path it represents.

drupal_get_path_alias in includes/path.inc

Given an internal Drupal path, return the alias set by the administrator.

File

includes/path.inc, line 40

Functions to handle paths in Drupal, including path aliasing.

Code

function drupal_lookup_path($action, $path = '') {

  // $map keys are Drupal paths and the values are the corresponding aliases
  static $map = array(), $no_src = array();
  static $count = NULL;

  // Use $count to avoid looking up paths in subsequent calls if there simply are no aliases
  if ($count === NULL) {
    $count = db_result(db_query('SELECT COUNT(pid) FROM {url_alias}'));
  }
  if ($action == 'wipe') {
    $map = array();
    $no_src = array();
  }
  elseif ($count > 0 && $path != '') {
    if ($action == 'alias') {
      if (isset($map[$path])) {
        return $map[$path];
      }
      if (!($alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path)))) {
        $alias = FALSE;
      }
      $map[$path] = $alias;
      return $alias;
    }
    elseif ($action == 'source' && !isset($no_src[$path])) {

      // Look for the value $path within the cached $map
      if (!($src = array_search($path, $map))) {
        if ($src = db_result(db_query("SELECT src FROM {url_alias} WHERE dst = '%s'", $path))) {
          $map[$src] = $path;
        }
        else {

          // We can't record anything into $map because we do not have a valid
          // index and there is no need because we have not learned anything
          // about any Drupal path. Thus cache to $no_src.
          $no_src[$path] = TRUE;
        }
      }
      return $src;
    }
  }
  return FALSE;
}