php next and prev page

[Collegeboox]

I was wondering if someone could give me the code for a next and prev button at the bottom of my search page...here is my code for the search page now however when I click next it says please fill in all search fields...

 

<?php


  // Get the search variable from URL

  $var = $_GET['search'] ;
  $searchtype = $_GET['searchtype'];
  $isbn = "ISBN";
  $school = "School";
  $title = "Title";
  $subject = "Subject";

  $trimmed = trim($var); //trim whitespace from the stored variable

// rows to return
$limit=10; 

// check for an empty string and display a message.
if ($trimmed == "")
  {
  echo "<p>Please enter a search...</p>";
  exit;
  }

// check for a search parameter
if (!isset($var))
  {
  echo "<p>We dont seem to have a search parameter!</p>";
  exit;
  }

//connect to your database
$connect = mysql_connect("db","username","pass") or die("Not connected");

//specify database 
mysql_select_db("db") or die("could not log in");

if ($searchtype == ($title))

{

	// Build SQL Query  
	$query = "select * from boox where name like \"%$trimmed%\"  
		 order by name"; // EDIT HERE and specify your table and field names for the SQL query
}
elseif ($searchtype == ($school))
{
		// Build SQL Query  
	$query = "select * from boox where school like \"%$trimmed%\"  
		 order by school"; // EDIT HERE and specify your table and field names for the SQL query

}
elseif ($searchtype == ($isbn))

{
	// Build SQL Query  
	$query = "select * from boox where isbn like \"%$trimmed%\"  
		 order by isbn"; // EDIT HERE and specify your table and field names for the SQL query
	 echo "isbn";

}
elseif ($searchtype == ($subject))

{
	// Build SQL Query  
	$query = "select * from boox where subject like \"%$trimmed%\"  
		 order by subject"; // EDIT HERE and specify your table and field names for the SQL query

}
$numresults=mysql_query($query);
$numrows=mysql_num_rows($numresults);

// If we have no results, offer a google search as an alternative

if ($numrows == 0)
  {
  echo "<h4>Results</h4>";
  echo "<p>Sorry, your search: "" . $trimmed . "" returned zero results</p>";

// google
echo "<p><a href=\"http://www.google.com/search?q=" 
  . $trimmed . "\" target=\"_blank\" title=\"Look up 
  " . $trimmed . " on Google\">Click here</a> to try the 
  search on google</p>";
  }

// next determine if s has been passed to script, if not use 0
  if (empty($s)) {
  $s=0;
  }

// get results
  $query .= " limit $s,$limit";
  $result = mysql_query($query) or die("Couldn't execute query");

// display what the person searched for
echo "<p>You searched for: "" . $var . "" in "" . $searchtype ."" </p>";

// begin to show results set
echo "Results  ";
$count = 1 + $s ;

if ($searchtype = $title)

{
// now you can display the results returned
  while ($row= mysql_fetch_array($result)) {
  $title = $row["name"];
  
  
		 echo "$count. $title &nbsp
	 </br><table width='297' border='1' align='center'>
  <tr>
    <td width='152'>Book Title:</td>
    <td width='129'>$row[name]</td>
  </tr>
  <tr>
    <td>Author:</td>
    <td>$row[author]</td>
  </tr>
    <tr>
    <td>ISBN#</td>
    <td>$row[isbn]</td>
  </tr>
  <tr>
    <td>Date Posted:</td>
    <td>$row[date]</td>
  </tr>
  <tr>
    <td>Posted By:</td>
    <td><a href='backpack.php?usr=$row[username]'>$row[username]</a></td>
  </tr>
  <tr>
    <td>School:</td>
    <td>$row[school]</td>
  </tr>
</table></br>";
		 $count++ ;
		 }
}
elseif ($searchtype = $school)
{
	// now you can display the results returned
	while ($row= mysql_fetch_array($result)) {
		$title = $row["school"];
		 echo "$count. $title" ;
		 $count++ ;
		 }

}
	elseif ($searchtype = $subject)
{
	// now you can display the results returned
	while ($row= mysql_fetch_array($result)) {
		$title = $row["subject"];
	 echo "$count. $title" ;
		 $count++ ;
		 }

}
	elseif ($searchtype = $isbn)
{
	// now you can display the results returned
	while ($row= mysql_fetch_array($result)) {
		$title = $row["isbn"];
		 echo "$count. $title" ;
		 $count++ ;
		 }

}



$currPage = (($s/$limit) + 1);

//break before paging
  echo "<br />";

  // next we need to do the links to other results
  if ($s>=1) { // bypass PREV link if s is 0
  $prevs=($s-$limit);
  print " <a href=\"$PHP_SELF?s=$prevs&q=$var\"><< 
  Prev 10</a>&nbsp ";
  }

// calculate number of pages needing links
  $pages=intval($numrows/$limit);

// $pages now contains int of pages needed unless there is a remainder from division

  if ($numrows%$limit) {
  // has remainder so add one page
  $pages++;
  }

// check to see if last page
  if (!((($s+$limit)/$limit)==$pages) && $pages!=1) {

  // not last page so give NEXT link
  $news=$s+$limit;

  echo " <a href=\"$PHP_SELF?s=$news&q=$var\">Next 10 >></a>";
  }

$a = $s + ($limit) ;
  if ($a > $numrows) { $a = $numrows ; }
  $b = $s + 1 ;
  echo "<p>Showing results $b to $a of $numrows</p>";
  
?>

[denno020]

You should look into using pagination. An example of this is Google's search results, and the o's that appear at the bottom with a page number. This is what you want, so do some Googling for pagination and you will find what you're after .

 

Denno