Wordpress snippet to filter Editor image adding

snippet.php

<?php
function html5_insert_image($html, $id, $caption, $title, $align, $url) {
	$html5 = "<figure id='post-$id media-$id' class='align-$align'>";
	$html5 .= "<img src='' data-src='$url' alt='$title' />";
	if ($caption) {
		$html5 .= "<figcaption>$caption</figcaption>";
	}
	$html5 .= "</figure>";
	return $html5;
}
add_filter( 'image_send_to_editor', 'html5_insert_image', 10, 9 );