Magento 2 create a custom attribute and save data

Create a custom module and follow the below step

Create InstallData.php file in Vender\Modulename\Setup

<?php

namespace Vender\Modulename\Setup;

use Magento\Framework\Module\Setup\Migration;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface {

    private $customerSetupFactory;

    public function __construct(\Magento\Customer\Setup\CustomerSetupFactory $customerSetupFactory) {
        $this->customerSetupFactory = $customerSetupFactory;
    }

    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {
        $installer = $setup;
        $installer->startSetup();
        $customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);
        $entityTypeId = $customerSetup->getEntityTypeId(\Magento\Customer\Model\Customer::ENTITY);

        $customerSetup->addAttribute(\Magento\Customer\Model\Customer::ENTITY, "custom_attribute", array(
            "type" => "int",
            "backend" => "",
            "label" => "Custom Attribute",
            "input" => "select",
            "visible" => true,
            'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Table',
            "required" => false,
            "default" => "",
            "frontend" => "",
            "unique" => true,
            "note" => "",
        ));

        $employee = $customerSetup->getAttribute(\Magento\Customer\Model\Customer::ENTITY, "custom_attribute");

        $employee = $customerSetup->getEavConfig()->getAttribute(\Magento\Customer\Model\Customer::ENTITY, 'custom_attribute');
        $used_in_forms[] = "adminhtml_customer";
        $used_in_forms[] = "checkout_register";
        $used_in_forms[] = "customer_account_create";
        $used_in_forms[] = "customer_account_edit";
        $used_in_forms[] = "adminhtml_checkout";
        $employee->setData("used_in_forms", $used_in_forms)
                ->setData("is_used_for_customer_segment", true)
                ->setData("is_system", 0)
                ->setData("is_user_defined", 1)
                ->setData("is_visible", 1)
                ->setData("is_used_in_grid", 1)
                ->setData("is_visible_in_grid", 1)
                ->setData("is_filterable_in_grid", 1)
                ->setData("is_searchable_in_grid", 1)
                ->setData("sort_order", 100);
        $employee->save();

        $installer->endSetup();
    }

}

<?php

namespace Vender\Modulename\Setup;

use Magento\Framework\Module\Setup\Migration;

use Magento\Framework\Setup\InstallDataInterface;

use Magento\Framework\Setup\ModuleContextInterface;

use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface {

private $customerSetupFactory;

public function __construct(\Magento\Customer\Setup\CustomerSetupFactory $customerSetupFactory) {

$this->customerSetupFactory = $customerSetupFactory;

}

public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {

$installer = $setup;

$installer->startSetup();

$customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);

$entityTypeId = $customerSetup->getEntityTypeId(\Magento\Customer\Model\Customer::ENTITY);

$customerSetup->addAttribute(\Magento\Customer\Model\Customer::ENTITY, "custom_attribute", array(

"type" => "int",

"backend" => "",

"label" => "Custom Attribute",

"input" => "select",

"visible" => true,

'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Table',

"required" => false,

"default" => "",

"frontend" => "",

"unique" => true,

"note" => "",

));

$employee = $customerSetup->getAttribute(\Magento\Customer\Model\Customer::ENTITY, "custom_attribute");

$employee = $customerSetup->getEavConfig()->getAttribute(\Magento\Customer\Model\Customer::ENTITY, 'custom_attribute');

$used_in_forms[] = "adminhtml_customer";

$used_in_forms[] = "checkout_register";

$used_in_forms[] = "customer_account_create";

$used_in_forms[] = "customer_account_edit";

$used_in_forms[] = "adminhtml_checkout";

$employee->setData("used_in_forms", $used_in_forms)

->setData("is_used_for_customer_segment", true)

->setData("is_system", 0)

->setData("is_user_defined", 1)

->setData("is_visible", 1)

->setData("is_used_in_grid", 1)

->setData("is_visible_in_grid", 1)

->setData("is_filterable_in_grid", 1)

->setData("is_searchable_in_grid", 1)

->setData("sort_order", 100);

$employee->save();

$installer->endSetup();

}

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