upgrade_423

WordPress Version: .10

/**
 * Execute changes made in WordPress 4.2.0.
 *
 * @since 4.2.3
 */
function upgrade_423()
{
    global $wp_current_db_version, $wpdb;
    if ($wp_current_db_version < 31536 && $wpdb->charset === 'utf8mb4') {
        if (is_multisite()) {
            $tables = $wpdb->tables('blog');
        } else {
            $tables = $wpdb->tables('all');
            if (defined('DO_NOT_UPGRADE_GLOBAL_TABLES')) {
                $global_tables = $wpdb->tables('global');
                $tables = array_diff_assoc($tables, $global_tables);
            }
        }
        foreach ($tables as $table) {
            maybe_convert_table_to_utf8mb4($table);
        }
    }
}