Php cookies demo example

<?php
error_reporting("E_ALL");
if(isset($_POST['reset']))
{
$expire=time()-60*60*24*30;
setcookie("setcookies", "", $expire);
}

if($_POST['email'])
{
$expire=time()+60*60*24*30;
setcookie("setcookies", $_POST['email'], $expire);

}
if (isset($_COOKIE["setcookies"]))
{
  echo "<b style='color:red;'>".$_COOKIE["setcookies"]."</b> this email id available !<br>";
  echo "if you want to delete email id then <form action='' method='post'><input type='submit' name='reset' value='Reset'></form>";

}
else
{
  echo "Email not available!<br>";
?>
<form action="" method="post">
Email: <input type="email" name="email">
<input type="submit" name="send" value="Submit">
</form>
<?php
}

?>
***********************************************
For check login user
<?php
session_start();
if(!isset($_SESSION['login'])) $_SESSION['login'] = 0;
if(isset($_COOKIE['web_login_cookie']) && $_SESSION['login'] == 0) {
    $sql = mysql_query("SELECT * FROM users");
    while($row = mysql_fetch_array($sql)) {
        $pass = sha1($row['password'] . '@#$%$#%dsf@#$SDFg');
        if($_COOKIE['web_login_cookie'] == $pass) {
            $_SESSION['userID'] = $row['userID'];
            $_SESSION['login'] = 1;
            if($row['level'] == 1) {
                $_SESSION['admin'] = 1;
            }
        }
    }
    if(mysql_num_rows($sql) == 0) {
        setcookie("web_login_cookie", "", time()+(60*60*24*14));
        session_destroy();
    }
}
?>