How to call a php script/function on a html button click

Question

Before someone has a go at me or marks this down, I have looked all over the internet to find out how to do this (including the same question on stackoverflow). I\'m new, an

Answer 1

the_function() {

$.ajax({url:"demo_test.php",success:function(result){

   alert(result); // will alert 1

 }});

}

// demo_test.php

Notes

1. Include jquery library for using the jquery Ajax
2. Keep the demo_test.php file in the same folder where your javascript file resides