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MySQL Paging Class



MySQL Paging Class

<?php 

   function findStart($limit) 
    { 
     if ((!isset($_GET['page'])) || ($_GET['page'] == "1")) 
      { 
       $start = 0; 
       $_GET['page'] = 1; 
      } 
     else 
      { 
       $start = ($_GET['page']-1) * $limit; 
      } 

     return $start; 
    } 
  /*
   * int findPages (int count, int limit) 
   * Returns the number of pages needed based on a count and a limit 
   */ 
   function findPages($count, $limit) 
    { 
     $pages = (($count % $limit) == 0) ? $count / $limit : floor($count / $limit) + 1; 

     return $pages; 
    } 
  /* 
   * string pageList (int curpage, int pages) 
   * Returns a list of pages in the format of "� < [pages] > �" 
   **/ 
   function pageList($curpage, $pages) 
    { 
     $page_list  = ""; 

     /* Print the first and previous page links if necessary */ 
     if (($curpage != 1) && ($curpage)) 
      { 
       $page_list .= "  <a href=\"".$_SERVER['PHP_SELF']."?page=1\" title=\"First Page\">�</a> "; 
      } 

     if (($curpage-1) > 0) 
      { 
       $page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage-1)."\" title=\"Previous Page\"><</a> "; 
      } 

     /* Print the numeric page list; make the current page unlinked and bold */ 
     for ($i=1; $i<=$pages; $i++) 
      { 
       if ($i == $curpage) 
        { 
         $page_list .= "<b>".$i."</b>"; 
        } 
       else 
        { 
         $page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".$i."\" title=\"Page ".$i."\">".$i."</a>"; 
        } 
       $page_list .= " "; 
      } 

     /* Print the Next and Last page links if necessary */ 
     if (($curpage+1) <= $pages) 
      { 
       $page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage+1)."\" title=\"Next Page\">></a> "; 
      } 

     if (($curpage != $pages) && ($pages != 0)) 
      { 
       $page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".$pages."\" title=\"Last Page\">�</a> "; 
      } 
     $page_list .= "</td>\n"; 

     return $page_list; 
    } 
  /*
   * string nextPrev (int curpage, int pages) 
   * Returns "Previous | Next" string for individual pagination (it's a word!) 
  */ 
   function nextPrev($curpage, $pages) 
    { 
     $next_prev  = ""; 

     if (($curpage-1) <= 0) 
      { 
       $next_prev .= "Previous"; 
      } 
     else 
      { 
       $next_prev .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage-1)."\">Previous</a>"; 
      } 

     $next_prev .= " | "; 

     if (($curpage+1) > $pages) 
      { 
       $next_prev .= "Next"; 
      } 
     else 
      { 
       $next_prev .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage+1)."\">Next</a>"; 
      } 

     return $next_prev; 
    } 
  } 
?> 


Example on how to use: 


<?php 
/* Instantiate class */ 
require_once("class.pager.php"); 
$p = new Pager; 

/* Show many results per page? */ 
$limit = 100; 

/* Find the start depending on $_GET['page'] (declared if it's null) */ 
$start = $p->findStart($limit); 

/* Find the number of rows returned from a query; Note: Do NOT use a LIMIT clause in this query */ 
$count = mysql_num_rows(mysql_query("SELECT field FROM table")); 

/* Find the number of pages based on $count and $limit */ 
$pages = $p->findPages($count, $limit); 

/* Now we use the LIMIT clause to grab a range of rows */ 
$result = mysql_query("SELECT * FROM table LIMIT ".$start.", ".$limit); 

/* Now get the page list and echo it */ 
$pagelist = $p->pageList($_GET['page'], $pages); 
echo $pagelist; 

/* Or you can use a simple "Previous | Next" listing if you don't want the numeric page listing */ 
//$next_prev = $p->nextPrev($_GET['page'], $pages); 
//echo $next_prev; 

/* From here you can do whatever you want with the data from the $result link. */ 
?>