I have a php code, which is in a div. It shows a random text placed in the random.txt file. I want to refresh this div, to load new text in every - let's say - 15 seconds without refreshing the whoe page.
I've found several solutions to reload divs without refreshing a page and it seems it can be done with AJAX or JS, but they only refresh it with a specific content or a specific file, however I can't figure out how to insert this code and have it refreshed.

This is how my div looks like:

<div id=randomtext> 

<?php

include_once(GetRandomText.php);

$MPTextFile = random.txt;

$MPSepString = *divider*;

$MPTextToHTML = false;

MPPrintRandomText($MPTextFile, $MPSepString, $MPTextToHTML);

?>

</div>

It loads a random text to the div at every refresh.

I tried to refresh the div it with the JS below, but it's not working at all. Sorry, I'm not good in it.

<script>

var auto_refresh = setInterval(

function () {

var newcontent= '<?php

include_once(GetRandomText.php);

$MPTextFile = random.txt;

$MPSepString = *divider*;

$MPTextToHTML = false;

MPPrintRandomText($MPTextFile, $MPSepString, $MPTextToHTML);

?>';

$('#randomtext').html(newcontent);

}, 1000);

</script>



<div id=randomtext></div>

Thanks in advance.