[[[PrestaShop]]] create module for PrestaShop CMS (complete code of main file)

[nameOfYourModuleInPrestaShopFileName].php

<?php

/*
This is main file example of new empty module for PrestaShop 1.7 (yeah, 1.7 not 1.6);
There you need to change name of module, name of class, and 'ANY_VALUE' for those what you need;

This code you can copy to your main file and that is! Work!

Addition information you can find at: [[[http://doc.prestashop.com/display/PS16/Creating+a+first+module]]] where I taught it
*/

if (!defined('_PS_VERSION_'))
    exit;

class NameOfYourModule extends Module {

    public function __construct() {
        $this->name = 'NameOfYourModule';
        $this->tab = 'front_office_features'; //for example 'back_office'
        $this->version = '0.1';
        $this->author = 'Andrew Negoda';
        $this->need_instance = 0;
        $this->ps_versions_compliancy = array('min' => '1.6', 'max' => _PS_VERSION_);
        $this->bootstrap = true;

        parent::__construct();

        $this->displayName = $this->l('You can out there name of module');
        $this->description = $this->l('You can ot there small descriptionof your module for user in back_office (admin panel)');

        $this->confirmUninstall = $this->l('Are you sure you want to uninstall?');

        if (!Configuration::get('ANY_VALUE'))
            $this->warning = $this->l('No config value');
    }

    public function install() {
        if (Shop::isFeatureActive())
            Shop::setContext(Shop::CONTEXT_ALL);

        if (!parent::install() ||
                !$this->registerHook('top') ||
                !$this->registerHook('header') ||
                !Configuration::updateValue('ANY_VALUE', '1234567abc')
        )
            return false;

        return true;
    }

    public function uninstall() {
        if (!parent::uninstall() ||
                !Configuration::deleteByName('ANY_VALUE')
        )
            return false;

        return true;
    }

    public function getContent() {
        $output = null;

        if (Tools::isSubmit('submit' . $this->name)) {
            $my_module_name = strval(Tools::getValue('ANY_VALUE'));
            if (!$my_module_name || empty($my_module_name) || !Validate::isGenericName($my_module_name))
                $output .= $this->displayError($this->l('Invalid value'));
            else {
                Configuration::updateValue('ANY_VALUE', $my_module_name);
                $output .= $this->displayConfirmation($this->l('Value is updated'));
            }
        }
        return $output . $this->displayForm();
    }

    public function displayForm() {
        // Get default language
        $default_lang = (int) Configuration::get('PS_LANG_DEFAULT');

        // Init Fields form array
        $fields_form[0]['form'] = array(
            'legend' => array(
                'title' => $this->l('Settings'),
            ),
            'input' => array(
                array(
                    'type' => 'html',
                    'label' => $this->l('File limit size (bytes):'),
                    'name' => 'ANY_VALUE',
                    'required' => true,
                    'html_content' => '<input style="width: 100px" type="number" name="ANY_VALUE" value="' . Configuration::get('ANY_VALUE') . '">'
                )
            ),
            'submit' => array(
                'title' => $this->l('Save'),
                'class' => 'btn btn-default pull-right'
            )
        );

        $helper = new HelperForm();

        // Module, token and currentIndex
        $helper->module = $this;
        $helper->name_controller = $this->name;
        $helper->token = Tools::getAdminTokenLite('AdminModules');
        $helper->currentIndex = AdminController::$currentIndex . '&configure=' . $this->name;

        // Language
        $helper->default_form_language = $default_lang;
        $helper->allow_employee_form_lang = $default_lang;

        // Title and toolbar
        $helper->title = $this->displayName;
        $helper->show_toolbar = true;        // false -> remove toolbar
        $helper->toolbar_scroll = true;      // yes - > Toolbar is always visible on the top of the screen.
        $helper->submit_action = 'submit' . $this->name;
        $helper->toolbar_btn = array(
            'save' =>
            array(
                'desc' => $this->l('Save'),
                'href' => AdminController::$currentIndex . '&configure=' . $this->name . '&save' . $this->name .
                '&token=' . Tools::getAdminTokenLite('AdminModules'),
            ),
            'back' => array(
                'href' => AdminController::$currentIndex . '&token=' . Tools::getAdminTokenLite('AdminModules'),
                'desc' => $this->l('Back to list')
            )
        );

        // Load current value
        $helper->fields_value['ANY_VALUE'] = Configuration::get('ANY_VALUE');


        return $helper->generateForm($fields_form);
    }

    public function hookDisplayTop($params) {
        $this->context->smarty->assign(
                array(
                    'some_value_from_this_module' => Configuration::get('ANY_VALUE')
                )
        );
        return $this->display(__FILE__, 'views/templates/hooks/NameOfYourModule.tpl');
    }

    public function hookDisplayRightColumn($params) {
        return $this->hookDisplayTop($params);
    }

    public function hookDisplayHeader() {
        $this->context->controller->addCSS($this->_path . 'css/NameOfYourModule.css', 'all');
    }

}