chamilo-lms2/main/inc/lib/formvalidator/Element/SelectTheme.php

<?php
/* For licensing terms, see /license.txt */

/**
 * A dropdownlist with all themes to use with QuickForm.
 */
class SelectTheme extends HTML_QuickForm_select
{
    /**
     * Class constructor.
     */
    public function __construct(
        $elementName = null,
        $elementLabel = null,
        $options = null,
        $attributes = null
    ) {
        parent::__construct($elementName, $elementLabel, $options, $attributes);
        // Get all languages
        $themes = api_get_themes();
        $this->_options = [];
        $this->_values = [];
        $this->addOption('--', ''); // no theme select
        foreach ($themes as $themeValue => $themeName) {
            $this->addOption($themeName, $themeValue);
        }
    }
}