Gazelle/sections/staffpm/multiresolve.php

<?
if ($IDs = $_POST['id']) {
	$Queries = array();
	foreach ($IDs as &$ID) {
		$ID = (int)$ID;

		// Check if conversation belongs to user
		$DB->query("SELECT UserID, AssignedToUser FROM staff_pm_conversations WHERE ID=$ID");
		list($UserID, $AssignedToUser) = $DB->next_record();

		if ($UserID == $LoggedUser['ID'] || $DisplayStaff == '1' || $UserID == $AssignedToUser) {
			// Conversation belongs to user or user is staff, queue query
			$Queries[] = "UPDATE staff_pm_conversations SET Status='Resolved', ResolverID=".$LoggedUser['ID']." WHERE ID=$ID";
		} else {
			// Trying to run disallowed query
			error(403);
		}
	}

	// Run queries
	foreach ($Queries as $Query) {
		$DB->query($Query);
	}
	// Clear cache for user
	$Cache->delete_value('staff_pm_new_'.$LoggedUser['ID']);
	$Cache->delete_value('num_staff_pms_'.$LoggedUser['ID']);

	// Done! Return to inbox
	header("Location: staffpm.php");

} else {
	// No id
	header("Location: staffpm.php");
}
?>