You can update such pages with code similar to this:

<?php

$data = "This message will be printed into printed.txt file";

$file= fopen("printed.txt", "w");
fwrite($file, $data);
fclose($file);

$file2= fopen("printed2.txt", "w");
fwrite($file2, $data);
fclose($file2);

echo "Printed.txt updated!";
echo "<br>";
echo "Printed2.txt updated!";

?>

The print.txt file will need to have write permissions 0777. You simply include the altered file into whatever page you need using php include or similar.

The $data can be put inside a while loop even and it will work from there - similar to this:

<?php

// Database connection
require('../config.php');

$result = mysql_query("select query here")
or die(mysql_error());

// keeps getting the next row until there are no more to get
while($row = mysql_fetch_array( $result )) {

$data .= "" . $row['row name here'] . "\r\n";

} ;

$file= fopen("printed.txt", "w");
fwrite($file, $data);
fclose($file);

$file2= fopen("printed2.txt", "w");
fwrite($file2, $data);
fclose($file2);

echo "Printed.txt updated!";
echo "<br>";
echo "Printed2.txt updated!";

?>