var attributes = elem_name.attributes;
text = ''
for (var key in attributes) {
/* Выбираем именно html-атрибуты */
if (attributes[key].nodeName) {
text += attributes[key].nodeName + ':' + attributes[key].nodeValue + ','
}
}

$.ajax({
type: "GET",
url: "index.php",
data: text
}).done(function( data ) {
});

$сlass= $_GET['сlass'];
$id= $_GET['id'];

$con = mysqli_connect('bla','bla','bla','bla');
$result = mysqli_query ($con,"INSERT INTO bla (class, id) VALUES ('$class','$id')");