bbp_sanitize_displayed_user_field( string $value = '', string $field = '', string $context = 'display' )

function bbp_sanitize_displayed_user_field( $value = '', $field = '', $context = 'display' ) {

	// Bail if not editing or displaying (maybe we'll do more here later)
	if ( ! in_array( $context, array( 'edit', 'display' ) ) ) {
		return $value;
	}

	// By default, no filter set (consider making this an array later)
	$filter = false;

	// Big switch statement to decide which user field we're sanitizing and how
	switch ( $field ) {

		// Description is a paragraph
		case 'description' :
			$filter = ( 'edit' === $context ) ? '' : 'wp_kses_data';
			break;

		// Email addresses are sanitized with a specific function
		case 'user_email'  :
			$filter = 'sanitize_email';
			break;

		// Name & login fields
		case 'user_login'   :
		case 'display_name' :
		case 'first_name'   :
		case 'last_name'    :
		case 'nick_name'    :
			$filter = ( 'edit' === $context ) ? 'esc_attr' : 'esc_html';
			break;

		// wp-includes/default-filters.php escapes this for us via esc_url()
		case 'user_url' :
			break;
	}

	// Run any applicable filters on the value
	if ( ! empty( $filter ) ) {
		$value = call_user_func( $filter, $value );
	}

	return $value;
}