url.php

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<?php
$url = elgg_extract('href', $vars, null);
if (!$url and isset($vars['value'])) {
    $url = trim($vars['value']);
    unset($vars['value']);
}

if (isset($vars['text'])) {
    if (elgg_extract('encode_text', $vars, false)) {
        $text = htmlspecialchars($vars['text'], ENT_QUOTES, 'UTF-8', false);
    } else {
        $text = $vars['text'];
    }
    unset($vars['text']);
} else {
    $text = htmlspecialchars($url, ENT_QUOTES, 'UTF-8', false);
}

unset($vars['encode_text']);

if ($url) {
    $url = elgg_normalize_url($url);

    if (elgg_extract('is_action', $vars, false)) {
        $url = elgg_add_action_tokens_to_url($url, false);
    }

    if (!elgg_extract('is_trusted', $vars, false)) {
        if (!isset($vars['rel'])) {
            $vars['rel'] = 'nofollow';
            $url = strip_tags($url);
        }
    }

    $vars['href'] = $url;
}

unset($vars['is_action']);
unset($vars['is_trusted']);

$attributes = elgg_format_attributes($vars);
echo "<a $attributes>$text</a>";