Magento 2 : Customer attribute creation

Copy<?php


namespace ExamNotes\Chapter10\Setup;

use Magento\Customer\Setup\CustomerSetupFactory;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Customer\Model\ResourceModel\Attribute;
use Magento\Eav\Model\Entity\Attribute\SetFactory as AttributeSetFactory;

class InstallData implements InstallDataInterface
{
    /**
     * @var CustomerSetupFactory
     */
    private $customerSetupFactory;

    /**
     * @var AttributeSetFactory
     */
    private $attributeSetFactory;

    /**
     * @var Attribute
     */
    private $attributeResource;

    /**
     * InstallData constructor.
     * @param CustomerSetupFactory $customerSetupFactory
     * @param AttributeSetFactory $attributeSetFactory
     * @param Attribute $attributeResource
     */
    public function __construct(
        CustomerSetupFactory $customerSetupFactory,
        AttributeSetFactory $attributeSetFactory,
        Attribute $attributeResource
    ) {
        $this->customerSetupFactory = $customerSetupFactory;
        $this->attributeSetFactory = $attributeSetFactory;
        $this->attributeResource = $attributeResource;
    }

    /**
     * @param ModuleDataSetupInterface $setup
     * @param ModuleContextInterface $context
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();
        $customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);
        $customerEntity = $customerSetup->getEavConfig()->getEntityType(\Magento\Customer\Model\Customer::ENTITY);
        $attributeSetId = $customerEntity->getDefaultAttributeSetId();

        $attributeSet = $this->attributeSetFactory->create();
        $attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);

        $customerSetup->removeAttribute(\Magento\Customer\Model\Customer::ENTITY, 'favourite_quote');
        $customerSetup->addAttribute(\Magento\Customer\Model\Customer::ENTITY, 'favourite_quote',
            [
                'type'         => 'varchar',
                'label'        => 'Favourite Quote',
                'input'        => 'text',
                'required'     => false,
                'visible'      => true,
                'user_defined' => true,
                'position'     => 900,
                'system'       => false,
                'is_used_in_grid' => true,
                'is_visible_in_grid' => true,
                'is_filterable_in_grid' => true,
                'is_searchable_in_grid' => true,
                ]);

        $favouriteQuote = $customerSetup->getEavConfig()->getAttribute(\Magento\Customer\Model\Customer::ENTITY,
            'favourite_quote');
        $favouriteQuote->setData('attribute_set_id', $attributeSetId);
        $favouriteQuote->setData('attribute_group_id', $attributeGroupId);
        $favouriteQuote->setData('used_in_forms', ['adminhtml_customer','customer_account_edit']);

        $this->attributeResource->save($favouriteQuote);

        $setup->endSetup();
    }
}

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$customerSetup->removeAttribute(Customer::ENTITY, 'is_otp_validated');
        $customerSetup->addAttribute(Customer::ENTITY, 'is_otp_validated', [
            'type' => 'int',
            'label' => 'Otp Validated',
            'input' => 'boolean',
            'required' => false,
            'visible' => true,
            'source' => Boolean::class,
            'backend' => '',
            'user_defined' => false,
            'is_user_defined' => false,
            'sort_order' => 999,
            'is_used_in_grid' => true,
            'is_visible_in_grid' => true,
            'is_filterable_in_grid' => true,
            'is_searchable_in_grid' => true,
            'position' => 999,
            'default' => 0,
            'system' => 0,
        ]);

        $otpValidated = $customerSetup->getEavConfig()->getAttribute('customer', 'is_otp_validated');

        if ($otpValidated->getId()) {
            $otpValidated->addData([
                'attribute_set_id' => $attributeSetId,
                'attribute_group_id' => $attributeDefaultGroupId,
                'used_in_forms' => ['adminhtml_customer']
            ]);
            $otpValidated->save();
        }