access serialize jquery in php

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Javascript

PHP

jQuery

Hi guys... i would like to use the .serialize() function of jquery i am submitting my form now i want to use that values passed in my php file but how can i access them? heres my html file

<form id="priviledge" method="POST" action="update.php">
        
   <input type="submit"  class= "button_active_red" id="save_new_user" name="save_new_user"/>

   <input type="checkbox" id="can_open_admin" name="can_open_admin" value="test" /><label for ="can_open_admin">Allow access to Admin panel</label>
        
   <input type="checkbox" id="can_modify_useraccount" name="can_modify_useraccount" /><label for ="can_modify_useraccount">Allow user to modify other accounts</label>

</form>

and heres my js code

$.ajax({
  type	: "POST",
  url	: "update.php",
  data	: {		
    "formData" : $("#priviledge").serialize() 
	},
  datatype : 'html',
  success: function(data) {			
	alert(data);
  }
});

now in my php file im trying to access the value but it echos an empty string heres my php file

$postForm = $_POST["formData"];
print_r($_POST["formData"]);

echo $_POST["formData"]["can_open_admin"] ;