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<?php
parse_str($options, $options);
$options = array_merge(array(
    'ul' => 0
), $options);

$lines = preg_split('/\n\r?/', trim($input));
$output = '<li>' . implode('</li><li>', $lines) . '</li>';

if ($options['ul']) {
    $output = '<ul>' . $output . '</ul>';
}
return $output;