Add an auto-increment integer at the end of an url when same alias name is used

// specify allowed contexts
$allowed_ctx = array('MYCTX');

// make sure we're using the right event
if (!in_array($modx->event->name, array('OnBeforeDocFormSave'))) return;
if (!$resource) return;

// make sure this only runs on new resources in specified contexts
if ($mode != 'new') return;
$ctx_key = $resource->get('context_key');
if (!in_array($ctx_key, $allowed_ctx)) return;

 

// $alias = $resource->get('alias'); // don't needed
// $id = $resource->get('id'); // $id is always 0 for new resources so we don't use that.
$pagetitle = $resource->get('pagetitle');

// create alias for lookup from pagetitle
$alias = $resource->cleanAlias($pagetitle);

// look for resources in ctx with existing alias but only if id != 0 (new resource)
$c = $modx->newQuery('modResource', array('alias' => $alias, 'id:!=' => 0, 'context_key' => $ctx_key));
if ($collection = $modx->getCollection('modResource', $c)) {
    foreach ($collection as $key => $object) {
        $existing[] = $object->get('alias');
    }
 
    $c = $modx->newQuery('modResource', array('pagetitle' => $pagetitle, 'id:!=' => 0, 'context_key' => $ctx_key));
    if ($collection = $modx->getCollection('modResource', $c)) {
        foreach ($collection as $key => $object) {
            $existing[] = $object->get('alias');
        }
    }
 
    $loop = true;
    $i = 0;
    while ($loop) {
        if ($i == 0) {
            $suffix = '';
        } else {
            $suffix = $i < 10 ? '-0' . $i : '-' . $i;
        }
        //$suffix = "-1";
 
        $newalias = $pagetitle . $suffix;
        $newalias = $resource->cleanAlias($newalias);
        $loop = in_array($newalias, $existing);
        $i++;
    }
 
    $resource->set('alias', $newalias);
}

// if no conflicting resources found, set alias we created from pagetitle
else {
    $resource->set('alias', $alias);
}


return null;

$existing = array();

$loop = in_array($newalias, $existing);

$exists = (bool) $modx->getCount('modResource', array('alias' => $newalias));
$loop = in_array($newalias, $existing) || $exists;