delete.php

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<?php
$widget_guid = (int) get_input('widget_guid');

$widget = get_entity($widget_guid);
if (!$widget instanceof \ElggWidget) {
    return elgg_error_response(elgg_echo('widgets:remove:failure'));
}

elgg_set_page_owner_guid($widget->getContainerGUID());

if (!elgg_can_edit_widget_layout((string) $widget->context)) {
    return elgg_error_response(elgg_echo('widgets:remove:failure'));
}

if (!$widget->delete()) {
    return elgg_error_response(elgg_echo('widgets:remove:failure'));
}

return elgg_ok_response();