if (!empty($_POST)){

    $email_to=$_POST['email_to'];
    $email_to=mysql_real_escape_string($_POST['email_to']);

    $sql = "UPDATE `cosmos`.`members` SET `conf` = '2' WHERE `members`.`email` = '$email_to';";
    $result=mysql_query($sql) or trigger_error(mysql_error().$sql);

    $count=mysql_affected_rows($result);                  // line 20
    if($count==1){

    $rows=mysql_fetch_array($result);
    $unique=$rows['u_code'];
    $name=$rows['username'];
    // ---------------- SEND MAIL FORM ---------------- 
    $to=$email_to; 
    $subject="Your Account Password Request! - Cosmos"; 
    $header="from: Tayal's/Cosmos <cosmos@gmail.com>"; 
    $messages= "Hey $name ,\r\n";
    $messages.="You recently requested a new password";
    $messages.="<br /><a href='confirm.php?uid" . $unique . "'>Confirmation Link</a> \r\n";
    $sentmail = mail($to,$subject,$messages,$header); 
    echo $messages; 
    }   else {
    echo "Not found your email in our database";
    }


}

警告：mysql_affected_rows（）期望参数1为资源，在第20行的C：\ wamp \ www \ a \ l \
forget.php中给出布尔值