user-additinoal-fields.php

<?php

function inspiry_add_user_additional_fields() {

	$form_fields = array(
		array(
			'name'     => esc_html__( 'Postal Code', 'framework' ),
			'id'       => 'postal_code',
			'type' => 'select',
			'options' => array(
				'37300' => '37300 A',
				'37400' => '37400 B',
				'37500' => '37500 C'
			),
			'title'    => esc_html__( '* Provide your area postal code.' ),
			'show'  => array( 'register_form', 'profile_backend', 'profile_frontend' )
		),
		array(
			'name'     => esc_html__( 'License Number', 'framework' ),
			'id'       => 'license_number',
			'required' => true,
			'title'    => esc_html__( '* Provide your license number.' ),
			'show'  => array( 'register_form', 'profile_backend', 'profile_frontend' )
		),
		array(
			'name'  => esc_html__( 'Car Name', 'framework' ),
			'id'    => 'car_name',
			'title' => esc_html__( '* Provide your car name.' ),
			'show'  => array( 'register_form', 'profile_backend', 'profile_frontend' )
		),
	);

	return $form_fields;
}
add_filter( 'inspiry_user_additional_fields', 'inspiry_add_user_additional_fields' );