Ask Question or Answer

There are lots of ways to make share button of Facebook on your website, before doing that I suggest you to set the following meta tags to give meta info to Facebook crawlers. Facebook will show its thumbnail image and its title info on news feed. 

<meta property="og:url" content="url"/>
<meta property="og:type" content="website"/>
<meta property="og:title"  content="page title" />
<meta property="og:description"  content="page brief description" />
<meta property="og:image" content="thumbnail image url"/>

And after that go to https://developers.facebook.com/docs/plugins/share-button/ and generate the code for your share button and place it to your website. It will looks like below. 

<div id="fb-root"></div>
  <script>(function(d, s, id) {
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) return;
    js = d.createElement(s); js.id = id;
    js.src = "https://connect.facebook.net/en_US/sdk.js#xfbml=1&version=v3.0";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));</script>

  <!-- Your share button code -->
  <div class="fb-share-button" 
    data-href="https://www.your-domain.com/your-page.html" 
    data-layout="button_count">
  </div>

Here, its a static for specific URL, to make it dynamic, change the data-href value accordingly to your page URL. Or there is an alternative way. Keep a share button link in your website and keep its link like below.   

<?php 
$url = "https://www.merospark.com"; //url of the page.
?>
<a href="https://www.facebook.com/sharer.php?u=<?php echo urlencode($url); ?>" 
rel="nofollow" target="_blank" class='btn btn-lg btn-primary'>Share Button</a>

In this way you can make a dynamic share button without using any SDK