bcc-admin-emails-on-user-meta.php

<?php
/**
 * BCC admin emails to different recipients based on user meta.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_bcc_admin_emails_on_user_meta( $headers, $email ) {
	// Set the meta key for the user meta we should check
	$meta_key = 'extra_info'; // Replace extra_info with your field name.

	// BCC checkout emails already going to admin_email.
	if ( strpos( $email->template, '_admin' ) !== false && strpos( $email->template, 'checkout' ) !== false ) {
		// Get the user (member)
		$user = get_user_by( 'email', $email->data['user_email'] );

		$meta_data = get_user_meta( $user->ID, $meta_key, true );

		// Set BCC values depending on whether the user has data for the meta key or not.
		if ( empty( $meta_data ) ) {
			$headers[] = 'Bcc:' . 'otheremail@domain.com';
		} else {
			$headers[] = 'Bcc:' . 'otheremail@domain.com,two@domain.com,three@domain.com';
		}

		return $headers;
	}
}
add_filter( 'pmpro_email_headers', 'my_pmpro_bcc_admin_emails_on_user_meta', 10, 2 );