bbp_is_user_deleted( int $user_id )

function bbp_is_user_deleted( $user_id = 0 ) {

	// Default to current user
	if ( empty( $user_id ) && is_user_logged_in() )
		$user_id = bbp_get_current_user_id();

	// No user to check
	if ( empty( $user_id ) )
		return false;

	// Assume user is not deleted
	$is_deleted = false;

	// Get user data
	$user = get_userdata( $user_id );

	// No user found
	if ( empty( $user ) ) {
		$is_deleted = true;

	// Check if deleted
	} elseif ( !empty( $user->deleted ) ) {
		$is_deleted = true;
	}

	return (bool) apply_filters( 'bbp_core_is_user_deleted', $is_deleted );
}