Question

I have a reminder mail sent to those who do not log on to my site after 30 days. Earlier I got an answer on this forum to create a seperate field and then update it as mentioned here: Need help on unix time stamp.

I have created a new field lastprelogin, now how do I update the respective field when I send the mail for inactive users.

<?php
include("include/data.php");
$query = "SELECT * FROM myusers WHERE DATE_ADD(FROM_UNIXTIME(lastprelogin), INTERVAL 15 DAY) < CURDATE()";
$result = mysql_query($query);
$num = mysql_numrows($result);
$i = 0;
while ($i < $num)
{
    //send mail code
    $sendmail = mail($to,$subject,$msg,$headers);
    $i++;
    if($sendmail) {
        $query1 = "UPDATE myusers SET lastprelogin='".time()."'";
        $result2 = mysql_query($query1);
    }
}
?>

How can I update the respective user’s lastprelogin field after sending the mail?

I am lost here beccause am unable to understand the logic in this part.

Answer 1

The logic of Your script is simple:

• retrieve all the users that didn’t log in for last 15 days
• send an email to each user
• and if that succeeds also update the field lastprelogin for that user

You have some important errors within Your script and this should be like this:

include("include/data.php");
$query = "SELECT * FROM myusers WHERE DATE_ADD(FROM_UNIXTIME(lastprelogin), INTERVAL 15 DAY) < CURDATE()";
$result = mysql_query($query);
while($user = mysql_fetch_assoc($result)) {
    // assuming that myusers table has these columns: user_id, user_name, user_email, lastprelogin
    //send mail code
    if(mail($user['user_email'],'Please log in','Please login to my site',$headers)) {
        $query1 = "update myusers set lastprelogin='".time()."' where user_id = {$user['usri_id']}";
        $result2 = mysql_query($query1);
    }
}
// end.

As a $headers variable You can set a From header, etc. Look for PHP mail function here: http://php.net/mail

Also the right query for updating should be this one:

"update myusers set lastprelogin='".time()."' where user_id = {$user['user_id']}"

anyway You will update the lastprelogin of all users everytime…