Embedding dynamic php content in javascipt

[dotkpay]

Hello,

How would I embed dynamic php content in javascript so that it can change accordingly without having to refresh the page?

For example I have a php script that tells time

 

<?php
$hour = date(H);
$min = date(i);

echo $hour,":",$min;
?>

 

Could you please add javascript to make it dynamic so that it can show real time, minute by minute without reloading the page.

Thanks in advance.