[Tutorial] Custom Aliasing: Creating Cross-Context Resources (Revo 2.2+)

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//Get the Request URL
    $url = $_SERVER['REQUEST_URI'];

//Remove GET/POST Parameters
    $pieces = explode('?', $url);
 
    $pieces[0] = trim($pieces[0], '/');
    $path = explode('/', $pieces[0]);
 
/* 
 * Checks if a Resource is a Site Alias
 */
    function isSiteAlias($alias)
    {   global $modx;
        $c = $modx->newQuery(
            'modResource', 
            array(
                'alias'=>$alias, 
                array(
                    'template'=>4,
                    'OR:template'=>5,
                ),
                'published'=>1, 
            )
        );
        $c->select(array('id','alias'));
        $c->limit(25);
        $c->prepare();
        $matches=$modx->getCollection('modResource',$c);
 
        foreach($matches as $res)
            return $res;
    }
 
/* 
 * Checks if a Resource is a Child of another Resource Id
 */
    function getParentResource($alias)
    {   global $modx;
        $c = $modx->newQuery(
            'modResource', 
            array(
                'published'=>1, 
                'alias'=>$alias,
                'template'=> XX //<-- Change to Category TemplateID
            )
        );
        $c->select(array('id','alias'));
        $c->limit(25);
        $c->prepare();
        $matches=$modx->getCollection('modResource',$c);
 
        foreach($matches as $res)
            return $res;
        return -1;
    }
// Initialize tracking vars
    $curId = -1;
    $toBaseId = -1;
    $atSegment = -1;
    foreach($path as $key => $segment)
    {
        $res = isSiteAlias($segment);
        if (!empty($res))
        {   if ($res->get('template') == 4)
            {   $catRes = getParentResource($path[$key - 1]);
                if ($catRes > -1)
                {
                    $catVal = $catRes->getTVValue('categoryValue'); //<-- Change to Category TV
                    $categories = explode(',',$res->getTVValue('categories'));
                    if (in_array($catVal, $categories'))   //<-- Change to Location TV holding Categories
                    {
                        $toBaseId = $res->get('id');
                        $atSegment = $key;
                        break;
                    }
                }
            }
            else if ($res->get('template') == 5)
            {
                $toBaseId = $res->get('id');
                $atSegment = $key;
                break;
            }
        }
    }
 
    if ($toBaseId > -1)
    {   $curId = $toBaseId;
        foreach($path as $key => $segment)
        {   if ($key > $atSegment)
            {   $chk = isChildResource($segment, $curId);
                if (!empty($chk))
                    $curId = $chk->get('id');
            }
        }
    }
 
    if ($curId > -1)
        $modx->sendForward($curId);