You can use .map().
Pass each element in the current matched set through a function, producing a new jQuery object containing the return value.
As the return value is a jQuery object, which contains an array, it's very common to call .get() on the result to work with a basic array.
Use
var arr = $('input[name="pname[]"]').map(function () {
return this.value; // $(this).val()
}).get();