在try / python除外之后停止运行程序(Stop program from running after try / except python)

 由于您希望通过电子邮件发送HTML表格，因此您只需创建一个HTML表格，并在每次出错时添加一些行。 然后将其包含在您的电子邮件内容中并发送邮件。 
 
$users = mysqli_query($con, "SELECT * FROM table");

// Table header
$htmlError = '<table><tr><th>ID</th><th>Column 1</th><th>Column 2</th></tr>';

while($row = mysqli_fetch_array($users)) {

    if  ($row['column1'] !=  $row['column2']) {
        // Add new row to table
        $htmlError .= '<tr><td>'.$row['id'].'</td><td>'.$row['column1'].'</td><td>'.$row['column2'].'</td></tr>';
    }
}

// End table
$htmlError .= '</table>';

// Send mail
...

As you want to send an HTML table by email, you just have to create an HTML table and add some lines each time you have an error. Then include it into your email's content and send the mail.
 
$users = mysqli_query($con, "SELECT * FROM table");

// Table header
$htmlError = '<table><tr><th>ID</th><th>Column 1</th><th>Column 2</th></tr>';

while($row = mysqli_fetch_array($users)) {

    if  ($row['column1'] !=  $row['column2']) {
        // Add new row to table
        $htmlError .= '<tr><td>'.$row['id'].'</td><td>'.$row['column1'].'</td><td>'.$row['column2'].'</td></tr>';
    }
}

// End table
$htmlError .= '</table>';

// Send mail
...