delete.php

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<?php

$guid = get_input('guid');
$entity = get_entity($guid);

if (!$entity instanceof ElggEntity) {
    register_error(elgg_echo('entity:delete:item_not_found'));
    forward(REFERRER);
}

if (!$entity->canDelete() || $entity instanceof ElggPlugin || $entity instanceof ElggSite) {
    register_error(elgg_echo('entity:delete:permission_denied'));
    forward(REFERRER);
}

set_time_limit(0);

// determine what name to show on success
$display_name = $entity->getDisplayName();
if (!$display_name) {
    $display_name = elgg_echo('entity:delete:item');
}

$type = $entity->getType();
$subtype = $entity->getSubtype();
$container = $entity->getContainerEntity();

if (!$entity->delete()) {
    register_error(elgg_echo('entity:delete:fail', array($display_name)));
    forward(REFERRER);
}

// determine forward URL
$forward_url = get_input('forward_url');
if (!$forward_url) {
    $forward_url = REFERRER;
    $referrer_url = !empty($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';
    $site_url = elgg_get_site_url();
    if ($referrer_url && 0 == strpos($referrer_url, $site_url)) {
        $referrer_path = substr($referrer_url, strlen($site_url));
        $segments = explode('/', $referrer_path);
        if (in_array($guid, $segments)) {
            // referrer URL contains a reference to the entity that will be deleted
            $forward_url = ($container) ? $container->getURL() : '';
        }
    } else if ($container) {
        $forward_url = $container->getURL() ? : '';
    }
}

$success_keys = array(
    "entity:delete:$type:$subtype:success",
    "entity:delete:$type:success",
    "entity:delete:success",
);

foreach ($success_keys as $success_key) {
    if (elgg_language_key_exists($success_key)) {
        system_message(elgg_echo($success_key, array($display_name)));
        break;
    }
}
forward($forward_url);