Benim arama result.My Arama fonksiyonu için sayfaları yapmaya çalışıyor Im iyi çalışıyor. Ancak, sayfa numarasına tıkladığınızda. Bu hata (aşağıda) görüntülenir:

Notice: Undefined index: search in C:\wamp\www\I-Document\new.php on line 8 ERROR: Select from dropdown

This message only should appear when there is no input in dropdown and no search input. Im not sure how to correct this. Please help! Thank u

<?php

//connecting to the database
include 'config.php';


$search = mysql_escape_string($_POST['search']);

$dropdown = mysql_escape_string($_POST['dropdown']); 

if (empty($search) && empty($dropdown)) {
die("Please choose your Search Criteria");
  } 

  //max displayed per page
  $per_page = 10;

  //get start variable  
  $start = $_GET['start'];

  //count records
  $record_count = mysql_query("SELECT COUNT(*) FROM document WHERE $dropdown LIKE     '%$search%'");


  //count max pages
  $max_pages = $record_count / $per_page; 

  if (!$start)
    $start = 0;

    //display data
    $query = mysql_query("SELECT * 
                            FROM document 
                           WHERE $dropdown LIKE '%$search%' 
                           LIMIT $start, $per_page");

    echo "<b><center>Search Result</center></b><br>";

    $num=mysql_num_rows($query);

    if ($num==0)
      echo "No results found";
    else {
      echo "$num results found!<p>"; 
    }

  echo "You searched for <b>$search</b><br /><br /><hr size='1'>";
  echo "<table border='1' width='600'>
          <th>File Reference No.</th>
          <th>File Name</th>
          <th>Owner</th>
          <th>Borrow</th>
       </tr>";

  while ($rows = mysql_fetch_assoc($query)) {
    echo "<tr>";
    echo "<td>". $rows['file_ref']  ."</td>";
    echo "<td>". $rows['file_name'] ."</td>";
    echo "<td>". $rows['owner'] ."</td>";
    echo "<td><a href=add_borrower.php?id=" . $rows['id'] . ">Borrow</a></td>";
    echo "</tr>";
  }

  echo "</table>"; 

 //setup prev and next variables
 $prev = $start - $per_page;
 $next = $start + $per_page;

 //show prev button
 if (!($start<=0)) 
   echo "<a href='new.php?start=$prev'>Prev</a> ";

 //show page numbers
 //set variable for first page
 $i=1;

 for ($x=0;$x<$record_count;$x=$x+$per_page) {
   if ($start!=$x)
     echo " <a href='new.php?start=$x'>$i</a> ";
   else
     echo " <a href='new.php?start=$x'><b>$i</b></a> ";

   $i++;
}
}

//show next button
if (!($start>=$record_count-$per_page))
  echo " <a href='new.php?start=$next'>Next</a>";

?>