<?php

 namespace xxxxxxCustomerAttrSetup;

 use MagentoEavSetupEavSetup;
  use MagentoEavSetupEavSetupFactory;
use MagentoFrameworkSetupInstallDataInterface;
use MagentoFrameworkSetupModuleContextInterface;
use MagentoFrameworkSetupModuleDataSetupInterface;
 use MagentoEavModelConfig;



 /**
     * @codeCoverageIgnore
     */
       class InstallData implements InstallDataInterface
         {
/**
 * Customer setup factory
 *
 * @var CustomerSetupFactory
 */
private $eavSetupFactory;

/**
 * Init
 *
 * @param CustomerSetupFactory $customerSetupFactory
 */
           public function __construct(EavSetupFactory $eavSetupFactory, Config $eavConfig)
{
    $this->eavSetupFactory = $eavSetupFactory;
    $this->eavConfig = $eavConfig;
}


public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
{
    $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
    $eavSetup->addAttribute(
        MagentoCustomerModelCustomer::ENTITY,
        'city',
        [
            'type' => 'varchar',
            'label' => 'city',
            'input' => 'text',
            'required' => false,
            'sort_order' => 100,
            'system' => false,
            'position' => 100,
            'is_used_in_grid' => true,
            'is_visible_in_grid' => true,
            'is_filterable_in_grid' => true,
            'is_searchable_in_grid' => true,
        ]
    );
    $eavSetup->addAttribute(
        MagentoCustomerModelCustomer::ENTITY,
        'area',
        [
            'type' => 'varchar',
            'label' => 'area',
            'input' => 'text',
            'required' => false,
            'sort_order' => 100,
            'system' => false,
            'position' => 100,
            'is_used_in_grid' => true,
            'is_visible_in_grid' => true,
            'is_filterable_in_grid' => true,
            'is_searchable_in_grid' => true,
        ]
    );
    $sampleAttribute = $this->eavConfig->getAttribute(MagentoCustomerModelCustomer::ENTITY, 'city');
    $sampleAttribute->setData(
        'used_in_forms',
        ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address' ,'customer_account_create']
    );
    $sampleAttribute->save();
    $sampleAttribute = $this->eavConfig->getAttribute(MagentoCustomerModelCustomer::ENTITY, 'area');
    $sampleAttribute->setData(
        'used_in_forms',
        ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address', 'customer_account_create']
    );
    $sampleAttribute->save();

}
}