variables - PHP Cookie Controls -

i working logic operator create cookie containing string of values depending on user's traffic path through website.

on web page have following variable

$lgc_code = '3' 

and cookie control set follows:

if ($lgc_code != '') {     $lgc=$lgc_code;      // check cookie     if (isset($_cookie['lgc_cntl'])) {          // read cookie         $lgc_codes=$_cookie['lgc_cntl'];          // check triggers in cookie         $expencarr = explode(",", $lgc_codes);         foreach($expencarr $code){             if ($code==$lgc_code) {$found='yes';}         }          if (isset($found)) {             $lgc_codes=$_cookie['lgc_cntl'];         } else {             $lgc_codes=$_cookie['lgc_cntl'].','.$lgc;         }  } else {     $lgc_codes=$lgc; } // add campaign cookie setcookie('lgc_cntl',$lgc_codes,time() + (86400 * 365), "/", ".domain.com"); // 86400 = 1 day  } else {     $lgc = '1';      if (isset($_cookie['lgc_cntl'])) {          // read cookie         $lgc_codes=$_cookie['lgc_cntl'];          // check triggers in cookie         $expencarr = explode(",", $lgc_codes);         foreach($expencarr $code){             if ($code==$lgc_code) {$found='yes';}         }          if (isset($found)) {             $lgc_codes=$_cookie['lgc_cntl'];         } else {             $lgc_codes=$_cookie['lgc_cntl'].','.$lgc;         }      } else {         $lgc_codes=$lgc;     }     // add campaign cookie     setcookie('lgc_cntl',$lgc_codes,time() + (86400 * 365), "/", ".domain.com"); // 86400 = 1 day } 

this works single variable being passed page cookie need able pass multiple variables @ once while comparing them cookie.

for example if page variable reads "1, 5, 10" , cookie contains "1 , 10" variable 5 need added.

currently, if add multiple variables on page, cookie duplicates them every time page loaded end "1,1,5,10,10"

how can modify code below compare variables , add ones not found in cookie already?

if $lgc_code may contain comma separated values, should converted array before comparison. try changing these lines

// check triggers in cookie $expencarr = explode(",", $lgc_codes); foreach($expencarr $code){     if ($code==$lgc_code) {$found='yes';} } 

to

// check triggers in cookie $expencarr = explode(",", $lgc_codes); $thispagearr = explode(",", $lgc_code); $newcodes = array_diff($thispagearr, $expencarr); if (!empty($newcodes)) { $found = 'yes'; }