Merge pull request #9310 from peterbo/9156-ForceNewVisitAtMidnight

 New visit after midnight - setting for disabling this characteristic, refs #9156 

config/global.ini.php

@@ -654,6 +654,10 @@ create_new_visit_when_campaign_changes = 1
 ; absent before, but is present now.
 create_new_visit_when_website_referrer_changes = 0
 
+; ONLY CHANGE THIS VALUE WHEN YOU DO NOT USE PIWIK ARCHIVING, SINCE THIS COULD CAUSE PARTIALLY MISSING ARCHIVE DATA
+; Whether to force a new visit at midnight for every visitor. Default 1.
+create_new_visit_after_midnight = 1
+
 ; maximum length of a Page Title or a Page URL recorded in the log_action.name table
 page_maximum_length = 1024;
 

plugins/CoreHome/Tracker/VisitRequestProcessor.php

@@ -10,6 +10,7 @@ namespace Piwik\Plugins\CoreHome\Tracker;
 
 use Piwik\Common;
 use Piwik\Date;
+use Piwik\Config;
 use Piwik\EventDispatcher;
 use Piwik\Exception\UnexpectedWebsiteFoundException;
 use Piwik\Tracker\Cache;
@@ -154,7 +155,9 @@ class VisitRequestProcessor extends RequestProcessor
         }
 
         $wasLastActionYesterday = $this->wasLastActionNotToday($visitProperties, $request);
-        if ($wasLastActionYesterday) {
+        $forceNewVisitAtMidnight = (bool) Config::getInstance()->Tracker['create_new_visit_after_midnight'];
+
+        if ($wasLastActionYesterday && $forceNewVisitAtMidnight) {
             Common::printDebug("Visitor detected, but last action was yesterday...");
 
             return true;