QUESTION Load ajax subpage

[werty1001]

Hi. This code echo all subpage. How show only 10 subpage and another load after with ajax.

PHP Code:

function getSubMenu($page){ 

 $children=getChildren($page); 

 foreach ($children as $subpage){ 
    $title=returnPageField($subpage,'title'); 
    $url=returnPageField($subpage,'slug'); 
    echo '<a href="/'.$url.'.html"> '.$title.'</a>'; 
  }

} 


How make php function which show subpage (number from ajax). For example ajax:

Code:

$.ajax({  
                    type: "POST",  
                    url: "",
                    context: this,
                    data: {
                              'num'       : '10'
                           },
                    success: function(data){
                      console.log(data);
                    },
                    error: function(data){
                      console.log('error' + data);
                    }
                });