how to run php function without reloading the page

Question

I am a newbie to php

   <?php
    getDBData(){
        //log the call
        $fetchedData = myDbCode.fetchData();
        return 
    }
  ?>
  <script type="text/javascript">
      dbData = <?php echo json_encode(getDBData()); ?>
  </script>

As observed in the log that getDBData get called only once during the page loading and later on even with dbData = <?php echo json_encode(getDBData()); ?> this code the call to getDBData() doesn't happen.

Any idea why the call to getDBData() happening only on page load and not thenafter

How to call getDBData() from javascript

Answer 1

You don't actually understand, how it works.

Javascript is a client-side language, which means, that it executes in web browser. PHP is server-side which mean it executes on server.

While handling request, first PHP is executed, that the response is returned to user, and then Javacript executes.

To communicate between client and server you can use ajax requests, which are basically simple http requests but without reloading whole page.