问如何从MySQL获得有限数量的结果，直到它到达列表的底部？

EN

<?php 
//Creating a connection
$con = mysqli_connect("localhost:3306","root","","story-db");

if (mysqli_connect_errno())
{
   echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
/*Get the id of the last visible item in the RecyclerView from the request and store it in a variable. For            the first request id will be zero.*/  


$sql= "Select * from story_table order by elapsed desc";

$result = mysqli_query($con ,$sql);

while ($row = mysqli_fetch_assoc($result)) {

    $array[] = $row;

}
header('Content-Type:Application/json');

echo json_encode($array);

mysqli_free_result($result);

mysqli_close($con);