How to count number of social shares on web page locally
<p>I have a Facebook share button on a page, 
And now the user shares a post on his/her timeline, Now what i want to do is count the number of times that specific user shares it in that session. </p>

<p>For Example the count will be initialized to 0 for all users , What i want is Each time a person shares a post successfully the count to increment. </p>

<p>We create a variable count and initialize to 0, now the share button works fine, How can i increment the count each time the post is successfully shared? 
What variables would be needed and how can this be done? </p>

<pre><code>&lt;?php
session_start();
$fbcount = $_SESSION['count'];

function incrememnt() {
      $fbcount++;
 }
?&gt;

&lt;script&gt;
document.getElementById('shareBtn').onclick = function() {
  FB.ui({
    method: 'share',
    display: 'popup',
    href: 'https://developers.facebook.com/docs/',
  }, function(response){});
}
&lt;/script&gt;
</code></pre>