php - how prevent include 2 times but if not included before include now -

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i have 1 file named header-guest.php
when open link http://royta.ir/badurl
code run: 

if(!isset($headerload)){ if(isset($_cookie['userid'])){     include_once('tmp/header.php'); } else{     include_once('tmp/header-guest.php'); } }

and when click on بازگشت به خانه
ajax code run in #content 

if(!isset($headerload)){ if(isset($_cookie['userid'])){     include_once('tmp/header.php'); } else{     include_once('tmp/header-guest.php');     include_once('block/index-visitor.php'); } }

and in header-guest.php have code 

<? echo $sitetitle; $headerload = 1;?>

but when click on badurl , click on بازگشت به خانه
header-guest.php run 2 times
how prevent it?

to prevent loading resources twice use require_once or include_once . prevent resource being loaded twice if happen put 2 include_once statements same resource.


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