Conditional buttons for Deep Linking to the Instagram App

instagram_deep_links.php

<?php

	// Detect our key devices
	$iPod    = stripos($_SERVER['HTTP_USER_AGENT'],"iPod");
	$iPhone  = stripos($_SERVER['HTTP_USER_AGENT'],"iPhone");
	$iPad    = stripos($_SERVER['HTTP_USER_AGENT'],"iPad");
	$Android = stripos($_SERVER['HTTP_USER_AGENT'],"Android");

	// if iPad or iPhone, add a deep link to launch the Instagram iOS App
	if( $iPod || $iPhone ){ ?>
	    <a href="instagram://user?username=jamesbavington">Follow me (Launch iOS App)</a>
	<?php }
	// if iPad there's no iPad Instagram App, so launch in the browser
	else if($iPad){ ?>
	    <a href="https://instagram.com/jamesbavington/" target="_blank">Follow me on Instagram</a>
	<?php }
	// if Android launch the Instagram Android App
	else if($Android){ ?>
	    <a href="instagram://user?username=jamesbavington">Follow me (Launch Android App)</a>
	<?php }
	// for any other device, just load the Instagram Website
	else { ?>
		<a href="https://instagram.com/jamesbavington/" target="_blank">Follow me on Instagram</a>

<?php }	?>

how do i use it. I do not have too much information
Can you help?

Its also possible by just adding the link without "https://" (e.g instargam.com/username) opens the app directly.