如何使div内容可下载到txt文件？

Question

My website generates a unique key(password) for each account to login. It is important, confidential, and unrecoverable. So how do I make it downloadable as txt for everyone.

This the code:

echo '<h2>';
print "Welcome  $username  to your dashboard<br>";

}
echo "</h2>";
echo "<p>";

$sec_value = 'usqi3289';
$rdecrypted_text = mcrypt_ecb(MCRYPT_DES, $sec_value, $userkey, MCRYPT_DECRYPT); 

echo "<div class='button special'>Your Userkey: <font color='black'>$rdecrypted_text</font></div>";
?>
 <br><p align="center">Please save your Userkey first,This is confidential and unrecoverable, because we don't hold any passwords. </p>

Mainly this one:

"<div class='button special'>Your Userkey: <font color='black'>$rdecrypted_text</font></div>"; ?>

I want a button below that so people click on it and it downloads a txt file containing this userkey .

Answer 1

You can put this code in a PHP file , eg userkeydl.php :

<?php

    header("Content-type: text/plain");
    header("Content-Disposition: attachment; filename = userkey.txt");

    print "Your Userkey is: \n";
    print $rdecrypted_text;
    print "\nPlease note that this is confidential and unrecoverable.";

?>