Displays share icons in WordPress using Font Awesome that open on pop ups

WP Share icons with Font awesome

if( ! function_exists('prefix_share_icons')):
/**
 * Display share icons
 */
function prefix_share_icons(){
	$share_string = '<a class="share-icon" href="%1$s" title="' .  '%2$s' . '" onclick="%3$s">%4$s<span class="hidden">%2$s</span></a>' ;

	$share_facebook = sprintf($share_string,
			'https://www.facebook.com/sharer/sharer.php?u=' . get_the_permalink() ,
			 _x('Share on Facebook', 'mytextdomain') ,
			'window.open(this.href, \'facebook-share\',\'width=580,height=296\');return false;',
			'<i class="fa fa-facebook"></i>');

	$share_twitter = sprintf($share_string,
			'https://twitter.com/share?text='. htmlspecialchars(urlencode(html_entity_decode(get_the_title(), ENT_COMPAT, 'UTF-8')), ENT_COMPAT, 'UTF-8') .'&amp;url='. get_the_permalink(),
			_x('Share on Twitter', 'mytextdomain'),
			'window.open(this.href, \'twitter-share\', \'width=550,height=235\');return false;',
			'<i class="fa fa-twitter"></i>');

	$share_googleplus = sprintf($share_string,
			'https://plus.google.com/share?url=' . get_the_permalink() ,
			_x('Share on Google+', 'mytextdomain') ,
			'window.open(this.href, \'google-plus-share\', \'width=490,height=530\');return false;',
			'<i class="fa fa-google-plus"></i>');


	echo '<div class="entry-share">' . $share_facebook . $share_twitter . $share_googleplus . '</div>';
}
endif;