PHP Count Unique Visitors ,, Not Works

Question

I am willing to count unique visitors once landing on a specific page, I wrote the below code, but the database updates each visit not uniquely,
tried to check the cookie in chrome settings, but did not find TestCookie
Then tried to check from Inspect->Network->Cookies I found my cookie in response cookies ,
Actually, I don't know if this means that it was saved or not, because if it is saved, so why database updates each repeated visit...

<?php include "db.php"; ?>
    <?php
    if(!isset($_COOKIE['TestCookie'])){
      setcookie("TestCookie","yes",60*60*24*320);
      mysqli_query($dbConnection,"UPDATE visits SET otal_count = total_count+1");
      print_r($_COOKIE);
    
    }else{
      return false;
    }
    ?>

Answer 1

Can you try to change third (expires_or_options) paramater of setcookie to

time() + 60*60*24*320

setcookie("TestCookie","yes",time() + 60*60*24*320);