跪求高手求救 如何在搜索引擎里加分页

这是我的引擎,
求哪位高手可以告诉我怎么加才会有分页?

<?php
include 'database.php';

function search_results($search) {
  $returned_results = array();
  $where = "";
  
  $search = preg_split('/[\s]+/', $search);
  $total_keywords = count($search);
  
  foreach($search as $key=>$keyword) {
  $where .= " `keywords` LIKE '%$keyword%' ";
if ($key != ($total_keywords - 1)) {
$where .= " AND ";
}
  }
   
  $results = "SELECT `tittle`, `description`, `link` FROM `search` WHERE $where";

  $results_num = ($results = mysql_query($results)) ? mysql_num_rows($results) : 0;

  if ($results_num === 0) {
  return false;
  } else {

  while ($results_row = mysql_fetch_assoc($results)) {
  $returned_results[] = array(
  'tittle' => $results_row['tittle'],
  'description' => $results_row['description'],
  'link' => $results_row['link']
  );
}
  return $returned_results;
  
  }
  
}
?>

SQL语句使用 Limit

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