extracting data with php : Helo friends, my code:

    <form>
      <input type="text" placeholder="name">
      <input type="text" placeholder="email">
      <input type="password" placeholder="pw">
      <button type="button" id="insert">Insert</button>
    </form>

my JS file:

    $('#CadAdmin').click(function(){
		$('input').each(function(){	
			$.post('/require/jp/insert.php',{
				dataUser:$(this).val()
			},function(res){
				alert(res);
			})
		})
	});

my insert.php file:

    extract($_POST); 
        print dataUser;
here, its show all data, ok but, I want to get separete data, for ex:
// print dataUser
print $name.' '.$email.' '.$pw;






