jQuery Forum

I have a form with a multiple select box. When I select more than one option and send the form via an ajax cal to a php file, only the last option will be saved. Why is that so?

This is the AJAX call:

var daten = $('#formulargesamt').serialize();
console.log(daten);

$.ajax({
  url: "/ajax/neukundenanlage/get_formular.php", 
  data: daten, 
  method: "POST",
});

n the console.log prompt all data is there (as a string). However in the PHP file it is an array with only the last selected option.
Does anyone have a idea how I can fix this? 

Thanks!