bp_ps_set_sort_options( $options )

function bp_ps_set_sort_options ($options)
{
	global $bp_ps_sort_options;

	if (!isset ($bp_ps_sort_options))  $bp_ps_sort_options = array ();
	list (, $fields) = bp_ps_get_fields ();

	$options = explode (',', $options);
	foreach ($options as $option)
	{
		$option = trim (preg_replace ('/\s+/', ' ', $option));
		$option = explode (' ', $option);

		$code = $option[0];
		$order = isset ($option[1])? $option[1]: 'asc';

		if (!isset ($fields[$code]->sort_directory) ||
			!is_callable ($fields[$code]->sort_directory) ||
			!in_array ($order, array ('asc', 'desc', 'both')))  continue;

		if ($order == 'asc')
		{
			$bp_ps_sort_options[$code] = $fields[$code]->name;
		}
		else if ($order == 'desc')
		{
			$bp_ps_sort_options['-'. $code] = $fields[$code]->name;
		}
		else if ($order == 'both')
		{
			$bp_ps_sort_options[$code] = $fields[$code]->name. " ⇡";
			$bp_ps_sort_options['-'. $code] = $fields[$code]->name. " ⇣";
		}
	}

	add_action ('bp_members_directory_order_options', 'bp_ps_display_sort_options');
}