A quick check to see if Ofcom's txparams have updated themselves

ofcom.php

<?php

// A small piece of code to check the Last-Modified header in PHP
// The below currently (on 16 October) returns:
// "Tue, 11 Oct 2016 11:26:59"
// ... so that's when it was last updated.

// I'm told that this URL is a permanent link. My assumption is that any update to the
// DAB, FM or AM data will produce an update for this main file; even though my own code
// actually just uses the .csv files.

$headers=get_headers('https://www.ofcom.org.uk/__data/assets/excel_doc/0017/91304/TxParams.xls',1);
echo $headers['Last-Modified']; 

// Here's how I use the above, in pseudocode...

// SELECT last_modified FROM ofcom WHERE title='txparams'
// if (last_modified <> $headers['Last-Modified']) {
//   then the txparams has changed
//   send_mail ("Ofcom have updated their txparams!)
//   UPDATE ofcom SET last_modified=$headers['Last-Modified'] WHERE title='txparams'
//   }

// I then run the above script once a day.

// Probably most helpfully...
// If you'd like to get an email when Ofcom have updated their txparams, then
// I'd be very happy to add you to the little list. Mail me at [email protected] 

?>