C:/xampp/htdocs/moodle/theme/formal_white/db/install.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die();

function xmldb_theme_formal_white_install() {

    // We need here to check whether or not the theme has been installed.
    // If it has been installed then we need to change the name of the settings to the new names.
    // If it is not installed it won't have any settings yet and we won't need to worry about this.
    $currentsetting = get_config('theme_formal_white');
    if (!empty($currentsetting)) {
        // Remove the settings that are no longer used by this theme
        // Remove regionwidth
        unset_config('regionwidth', 'theme_formal_white');
        // Remove alwayslangmenu
        unset_config('alwayslangmenu', 'theme_formal_white');

        // previous releases of formal_white them were not equipped with version number
        // so I can not know if a theme specific variable exists or not.
        // This is the reason why I try to use them both.
        if (!empty($currentsetting->backgroundcolor)) {
            // Create a new config setting called lblockcolumnbgc and give it backgroundcolor's value.
            set_config('lblockcolumnbgc', $currentsetting->backgroundcolor, 'theme_formal_white');
            // Remove backgroundcolor
            unset_config('backgroundcolor', 'theme_formal_white');
        } elseif (!empty($currentsetting->blockcolumnbgc)) {
            // Create a new config setting called lblockcolumnbgc and give it blockcolumnbgc's value.
            set_config('lblockcolumnbgc', $currentsetting->blockcolumnbgc, 'theme_formal_white');
            // Remove blockcolumnbgc
            unset_config('blockcolumnbgc', 'theme_formal_white');
        }
    }

    return true;
}