Cookies файлы не создаются

<?php
if (!empty($_COOKIE['student'])){
$student= $_COOKIE['student'];
mysql_connect("   ", "  ", "   ");
        mysql_select_db("   ");
        mysql_set_charset("utf8");
 
 $res=mysql_query("SELECT name,surname,age FROM users WHERE login='$student' ");
 
 while ($res1= mysql_fetch_array($res)) {
    
   $name=$res1['name'];
   
 $surname=$res1['surname'];
 
 $age=$res1['age'];
$seredne=0;
 
}
}
else
{
    echo "EROR";
}
setcookie("surname_student", $surname, time() + 3600*24);
setcookie("name_student", $name, time() + 3600*24);
mysql_close();
mysql_connect("  ", "  ", "  ");
        mysql_select_db("  ");
        mysql_set_charset("utf8");
 
$all_marks_res=mysql_query("SELECT Mark FROM marks WHERE Name='$name' AND Surname='$surname'");
$mark=array();
while($marks=mysql_fetch_array($all_marks_res))
{
    $mark[]=$marks['Mark'];
    
}
for($i=0;$i<count($mark);$i++)
{
    $seredne+=$mark[$i];
}
$seredne=$seredne/count($mark);
 
mysql_close();
$json_name=json_encode($name);
$json_surname=json_encode($surname);
$json_age=json_encode($age);
$json_seredne=json_encode($seredne);
?>

  <?php
    if (!empty($_COOKIE['name_student']) && !empty($_COOKIE['surname_student'])){
    $name=$_COOKIE['name_student'];
    $surname=$_COOKIE['surname_student'];
  
    mysql_connect("  ", "  ", "  ");
        mysql_select_db("  ");
        mysql_set_charset("utf8");
}
        
        $inform=mysql_query("SELECT City,School,Class FROM users WHERE Name='$name' AND Surname='$surname' ");
        $school;
        $class;
        $city;
         while($inf=mysql_fetch_assoc($inform))
         {
            $school=$inf['School'];
            $class=$inf['Class'];
            $city=$inf['City'];
         }
        $comment=array();
        $date=array();
   
   
    $all_dz=mysql_query("SELECT Dz,Date FROM dz WHERE School='$school' AND Class='$class' AND City='$city' ");
            
        while($dz=mysql_fetch_assoc($all_dz))
        {?>
            <hr class="scnd-font-color"><h1><?php echo $dz['Dz'];?></h1><p class="scnd-font-color"><?php echo $dz['Date'];?></p><hr class="scnd-font-color">
        
 
        <?php }?>