PHP Pagination

pager.php

<?php
  // global configuration,
  $page_size = 5; // how many items per page
  $page_start = 1; // the starting page
  // how many numbers will be shown before and after current, including current
  $page_range_near = 3;



  // The number of items to paginate through, most likely the result of
  // a "SELECT COUNT(*)" query.
  $item_count = 1000;

  // Divide the number of items by the page size and round up to the nearest
  // integer.
  $num_pages = ceil($item_count / $page_size);

  $current_page = 25; // what page you're on right now

  // grab the current page if specified in the URL
  if(isset($_GET['page'])){
    $current_page = (int) $_GET['page'];
  }

  function pagination($start, $num_pages, $current, $near = 3){
    // True if the for loop is within a range of hidden numbers, represented
    // by an ellipsis.
    $hidden_range = false;

    // $out: output string.  Would probably be better served by an array
    // that you push your output into, then join and return at the
    // end, but at this point that's premature optimization
    $out = "<ul class=\"pagination\">";
    for($pg = $start; $pg <= $num_pages; $pg++){
      if(
        // Always show the number for the first page.
        $pg == $start
        ||
        // Always show the number for the last page.
        $pg == $num_pages
        ||
        // Show the number for the current page.
        $pg == $current
        ||
        // Show the number if it's within $near of current page
        (
          $pg > $current - $near
          &&
          $pg < $current + $near
        )
      ){
        // Output page number
        if($pg == $current){
          $out.="<li><a href='/pager.php?page=$pg'><strong>$pg</strong></a></li>";
        }else{
          $out.="<li><a href='/pager.php?page=$pg'>$pg</a></li>";
        }
        $hidden_range = false;
      }else{
        if(!$hidden_range){
          $out.="<li>...</li>";
          $hidden_range = true;
        }
      }
    }
    $out.= "</ul>";
    return $out;
  }
?>

<?php echo pagination($page_start, $num_pages, $current_page, $page_range_near); ?>