tag.php

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<?php
if (empty($vars['value']) && $vars['value'] !== 0 && $vars['value'] !== '0') {
    return;
}

$query_params = array();

$query_params["q"] = $vars['value'];
$query_params["search_type"] = "tags";

if (!empty($vars['type'])) {
    $query_params["type"] = $vars['type'];
    unset($vars['type']);
}

if (!empty($vars['subtype'])) {
    $query_params["subtype"] = $vars['subtype'];
    unset($vars['subtype']);
}

$url = !empty($vars['base_url']) ? $vars['base_url'] : 'search';
unset($vars['base_url']);

$url .= '?' . http_build_query($query_params);

$params = array(
    'href' => $url,
    'text' => $vars['value'],
    'encode_text' => true,
    'rel' => 'tag',
);

$params = $params + $vars;

echo elgg_view('output/url', $params);