upgrade.php

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<?php
$object = elgg_get_entities(array(
    'type' => 'object',
    'subtype' => 'moddefaultwidgets',
    'limit' => 1,
));

if (!$object) {
    forward(REFERER);
}

$object = $object[0];

$site = elgg_get_site_entity();

$ia = elgg_set_ignore_access(true);
foreach (array('profile', 'dashboard') as $context) {
    if (isset($object->$context)) {
        elgg_push_context($context);
        elgg_push_context('default_widgets');
        elgg_push_context('widgets');

        // deserialize the widget information
        list($left, $middle, $right) = split('%%', $object->$context);
        $left_widgets = split('::', $left);
        $middle_widgets = split('::', $middle);
        $right_widgets = split('::', $right);

        // 1st column is right column in default theme
        $widgets = array(
            1 => array_reverse($right_widgets),
            2 => array_reverse($middle_widgets),
            3 => array_reverse($left_widgets),
        );

        foreach ($widgets as $column => $column_widgets) {
            foreach ($column_widgets as $handler) {
                $guid = elgg_create_widget($site->getGUID(), $handler, $context);
                if ($guid) {
                    $widget = get_entity($guid);
                    $widget->move($column, 0);
                }
            }
        }

        elgg_pop_context();
        elgg_pop_context();
        elgg_pop_context();
    }
}
elgg_set_ignore_access($ia);

$object->delete();
system_message(elgg_echo('upgrade:core'));
forward(REFERER);