drupal_lookup_path
Definition
drupal_lookup_path($action, $path = '')
drupal-5/includes/path.inc, line 41
Description
Given an alias, return its Drupal system URL if one exists. Given a Drupal system URL return one of its aliases if such a one exists. Otherwise, return FALSE.
Parameters
$action One of the following values:
- wipe: delete the alias cache.
- alias: return an alias for a given Drupal system path (if one exists).
- source: return the Drupal system URL for a path alias (if one exists).
Return value
Either a Drupal system path, an aliased path, or FALSE if no path was found.
Code
<?php
function drupal_lookup_path($action, $path = '') {
// $map keys are Drupal paths and the values are the corresponding aliases
static $map = array(), $no_src = array();
static $count;
// Use $count to avoid looking up paths in subsequent calls if there simply are no aliases
if (!isset($count)) {
$count = db_result(db_query('SELECT COUNT(pid) FROM {url_alias}'));
}
if ($action == 'wipe') {
$map = array();
$no_src = array();
}
elseif ($count > 0 && $path != '') {
if ($action == 'alias') {
if (isset($map[$path])) {
return $map[$path];
}
$alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path));
$map[$path] = $alias;
return $alias;
}
// Check $no_src for this $path in case we've already determined that there
// isn't a path that has this alias
elseif ($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;
}
?>