include() or require() the file with the code.

You can use the php function filemtime($filename))

$filename = ‘full path to the file.php’;

// format it to look nice
echo ‘Last Published: ‘ .date (”F d Y H:i:s.”, filemtime($filename));

To have this in its own separate include file is a bit of overkill. If you had multiple lines of logic then I would suggest writing a function. I have a common function file that I keep all functions in and then include it on each page.

To write this as a function you could do this:

// where $filename is the path and name of file you are using
function _displayPubDate($filename){
echo ‘Last Published: ‘ .date (”F d Y H:i:s.”, filemtime($filename));

}

Then, in your code, you would output this where you want it to display

What I would do is this: make an array of all pages you want to be included.

$pages = array(’index.html’, ‘home.php’, ‘etc’, ‘etc’);

then with that, you could use this code:

function doIncludePages() {
global $pages;
foreach($pages as $page) {
@require_once($page);
}
}

and use that at the beginning of the file.

Note: creating the array of pages could also help prevent being hacked, if you run a check.