filter.php

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<?php
// create selection array
$options = array();
$options['type=all'] = elgg_echo('river:select', array(elgg_echo('all')));
$registered_entities = elgg_get_config('registered_entities');

if (!empty($registered_entities)) {
    foreach ($registered_entities as $type => $subtypes) {
        // subtype will always be an array.
        if (!count($subtypes)) {
            $label = elgg_echo('river:select', array(elgg_echo("item:$type")));
            $options["type=$type"] = $label;
        } else {
            foreach ($subtypes as $subtype) {
                $label = elgg_echo('river:select', array(elgg_echo("item:$type:$subtype")));
                $options["type=$type&subtype=$subtype"] = $label;
            }
        }
    }
}

$params = array(
    'id' => 'elgg-river-selector',
    'options_values' => $options,
);
$selector = $vars['selector'];
if ($selector) {
    $params['value'] = $selector;
}
echo elgg_view('input/select', $params);

elgg_load_js('elgg.ui.river');