Turn email notification OFF for new users for BuddyBoss and BuddyPress

buddypress-email-setting-manipulation.php

<?php

/**
 * Disable email notification.
 *
 * @param  integer $user_id User ID.
 * @return void
 */
function buddyboss_set_email_notifications_preference( $user_id ) {

	// Prevent fatal error if plugin is not available.
	if ( ! function_exists( 'bp_update_user_meta' ) || empty( $user_id ) ) {
		return;
	}

	// Setting keys.
	$settings_keys = array(
		'notification_activity_new_mention'        => 'no',
		'notification_activity_new_reply'          => 'no',
		'notification_friends_friendship_request'  => 'no',
		'notification_friends_friendship_accepted' => 'no',
		'notification_groups_invite'               => 'no',
		'notification_groups_group_updated'        => 'no',
		'notification_groups_admin_promotion'      => 'no',
		'notification_groups_membership_request'   => 'no',
		'notification_messages_new_message'        => 'no',
	);

	// Update setting
	foreach( $settings_keys as $setting => $preference ) {
		bp_update_user_meta( $user_id, $setting, $preference );
	}

}

add_action( 'user_register', 'buddyboss_set_email_notifications_preference' );