//Html to have count dumped into - Resides in the DOM.

 <p><span id="count"></span> is the current count number.</p>


//Javascript call to retrieve count from external text source.  Call writeCount(); on Dom load to execute.

function writeCount(){
        $.get( "count.txt", function(data) {
            $("#count").html( data );
            });
    }
//count.txt only contains the incremented number.


// javascript function to increment the count.  calls external PHP file.  run pushScript(); whenever you want to increment the count (on load, on form submit, whenever);

function pushScript() {
    $.ajax({ url: 'script.php' });
    }


//PHP file called that increments the count.

<?php
$current = file_get_contents("count.txt");
$new = $current + 1;
file_put_contents("count.txt", $new);
?>