use of Sharer.php is not right way to put share button on the website . but you can use following code to make it work
put belowed code in the head tag
<meta property="og:url" content="https://www.archirayan.com/facebook-integration-with-website" />
<meta property="og:type" content="website" />
<meta property="og:title" content="Archirayan infotech" />
<meta property="og:description" content="" />
<meta property="og:image" content=""http://archirayan.com/assets/images/logo-home.png" />
and try to put the code where you want to put facebook share button
<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";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<!-- Your share button code -->
<div class="fb-share-button"
data-href="https://www.archirayan.com/facebook-integration-with-website"
data-layout="button_count">
</div>
it should work like charm !!