Generate a username during checkout for user [Paid Memberships Pro]

generate-username-from-email-pmpro.php

<?php
/**
 * Make user name email address the same
 * Hide your 'username' field using custom CSS.
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_generate_username_at_checkout() {

	//check for level as well to make sure we're on checkout page
	if (empty($_REQUEST['level'])) {
		return;
	}

	if (!empty($_REQUEST['bemail'])) {
		$_REQUEST['username'] = my_pmpro_generate_username_from_email($_REQUEST['bemail']);
	}

	if (!empty($_POST['bemail'])) {
		$_POST['username'] = my_pmpro_generate_username_from_email($_POST['bemail']);
	}

	if (!empty($_GET['bemail'])) {
		$_GET['username'] = my_pmpro_generate_username_from_email($_GET['bemail']);
	}

}
add_action('init', 'my_pmpro_generate_username_at_checkout');

/**
 * Hide the username field on checkout.
 */
function my_pmpro_unset_required_username_checkout( $pmpro_required_user_fields ) {
	unset( $pmpro_required_user_fields['username'] );
	return $pmpro_required_user_fields;
}
add_filter('pmpro_required_user_fields', 'my_pmpro_unset_required_username_checkout', 10, 2);


/**
 * Generate a username from a user's email address.
 * Helper function.
 */
function my_pmpro_generate_username_from_email($email) {

	return $email;
}