php sayfalama da sayfa id almak

unction searchFilter(page_num) {
page_num = page_num?page_num:0;
var keywords = $('#keywords').val();
var urunid = $('#urunid').val();
var sortBy = $('#sortBy').val();
$.ajax({
type: 'POST',
url: 'urunvericekme/getData.php',
data:'page='+page_num+'&keywords='+keywords+'&sortBy='+sortBy ,
beforeSend: function () {
$('.loading-overlay').show();
},
success: function (html) {
$('#posts_content').html(html);
$('.loading-overlay').fadeOut("slow");
}
});
}