Display content method in documentation

[simakk]

Hello guys ! Following the prestashop 1.5 documentation, i'm having challenges in the helper function. On adding the following code, i am receiving a parse error but when i am commenting it out module loads successfuly. Where could i be going wrong?

	 public function displayForm()
	 {

    $default_lang = (int)Configuration::get('PS_LANG_DEFAULT');

    $fields_form[0]['form'] = array(
        'legend' => array(
            'title' => $this->l('Settings'),
        ),
        'input' => array(
            array(
                'type' => 'text',
                'label' => $this->l('Configuration value'),
                'name' => 'WELCOME_NAME',
                'size' => 20,
                'required' => true
            )
        ),
        'submit' => array(
            'title' => $this->l('Save'),
            'class' => 'button'
        )
    );
     
    $helper = new HelperForm();

    $helper->module = $this;
    $helper->name_controller = $this->name;
    $helper->token = Tools::getAdminTokenLite('AdminModules');
    $helper->currentIndex = AdminController::$currentIndex.'&configure='.$this->name;
    $helper->default_form_language = $default_lang;
    $helper->allow_employee_form_lang = $default_lang;
     

    $helper->title = $this->displayName;
    $helper->show_toolbar = true;       
    $helper->toolbar_scroll = true;   
    $helper->submit_action = 'submit'.$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')
        )
    );
     
    
    $helper->fields_value['WELCOME_NAME'] = Configuration::get('WELCOME_NAME');
     
    return $helper->generateForm($fields_form);
	 }