Never Online PHP Batch Job

[Chip (OP)]

Report and/or email and/or delete members who have never logged in.

<?php
$servername = "localhost";
$username = "dbuser";
$password = "dbpass";
$dbname = "smf";
$tbpref = "smf_";

// SET THESE TOO !
$days_since_registered = 30;
$do_email = 0;  // note this setting (run script with both off for testing)
$do_delete = 0; // care with this setting
// -------------

$connect = new mysqli($servername, $username, $password, $dbname);
if ($connect->connect_error) {
        die("Connection failed: " . $connect->connect_error);
}

$sql = "SELECT * FROM" . " " . $tbpref . "members WHERE last_login = '0'";


$result = $connect->query($sql);

if ($result->num_rows > 0) {
        // output data of each row
        while($row = $result->fetch_assoc()) {
                $datereg = $row["date_registered"];
                $current_date = date("U") /* to have it in microseconds */;
                $your_month = date("m", $datereg);
                $your_day = date("d", $datereg);
                $your_year =  date("Y", $datereg);
                $selected_date_stamp = mktime(0,0,0,$your_month,$your_day,$your_year);
                $selected_date = date("U",$selected_date_stamp);
                $difference = round (($current_date - $selected_date)/(3600*24));
                if ($difference >= $days_since_registered) {
                        echo $row["member_name"] . " " . $row["email_address"] . " " . "registered" . " " . $difference . " " . "days ago" . PHP_EOL;
                        $to_member =  $row["member_name"];
                        $from_name = "SMF Administrator";
                        $from_email = "smfadmin@site-name";
                        $headers = "From: $from_name <$from_email>";
                        $body = "Dear $to_member, \n
You have never logged in to https://site-name since you joined us so I will be removing you within 2 weeks unless you do so. \n
I have already activated your account but both that email and your activation mail probably went to your spam folder. \n
If you have any questions or need any help on this matter then just reply to me. \n
Regards, \n
Server Admin";
                        $subject = "Regarding your inactive membership";
                        $to_email = $row["email_address"];

                        if ($do_email) {
                                if (mail($to_email, $subject, $body, $headers)) {
                                        echo "(email sent)" . " ";
                                } else {
                                        echo "email failed" . " ";
                                }
                        }

                        if ($do_delete) {
                                $sql2 = "DELETE FROM" . " " . $tbpref . "members WHERE member_name = '$to_member' ";
                                if ($connect->query($sql2) === TRUE) {
                                        echo "$to_member deleted successfully";
                                } else {
                                        echo "Error deleting record: " . $connect->error;
                                }
                        }
                }
        }
} else {
        echo "0 results";
}

$connect->close();
?>