如何回显“无结果”消息，当没有在MYSQL中找到搜索结果

我在我的网站上有一个mysql关键字搜索，它工作得很好。问题是，当有人搜索我没有添加的关键字时，结果页面上什么也没有显示。而不是什么都没有出现，我想有一个没有结果被发现的消息。我被告知必须使用以下代码:

<?php 
if (mysql_num_rows($rs_main) == 0) {
    echo "No records found.";
}
?>

但在过去的几天里，我一直试图在我的代码中实现该代码，但由于某种原因，我无法让它工作。如果有人能告诉我在哪里以及如何在我的代码中正确实现上面的代码来解决我的问题，我将非常感激，提前感谢。

这是我的代码，这样你可以更好地理解我的问题

<?php
function buildNavigation($pageNum_Recordset1,$tot… | ",$max_links=10, $show_page=true)
{
                GLOBAL $maxRows_Recordset1,$totalRows_Recordset…
    $pagesArray = ""; $firstArray = ""; $lastArray = "";
    if($max_links<2)$max_links=2;
    if($pageNum_Recordset1<=$totalPages_R… && $pageNum_Recordset1>=0)
    {
        if ($pageNum_Recordset1 > ceil($max_links/2))
        {
            $fgp = $pageNum_Recordset1 - ceil($max_links/2) > 0 ? $pageNum_Recordset1 - ceil($max_links/2) : 1;
            $egp = $pageNum_Recordset1 + ceil($max_links/2);
            if ($egp >= $totalPages_Recordset1)
            {
                $egp = $totalPages_Recordset1+1;
                $fgp = $totalPages_Recordset1 - ($max_links-1) > 0 ? $totalPages_Recordset1  - ($max_links-1) : 1;
            }
        }
        else {
            $fgp = 0;
            $egp = $totalPages_Recordset1 >= $max_links ? $max_links : $totalPages_Recordset1+1;
        }
        if($totalPages_Recordset1 >= 1) {
            #    ------------------------
            #    Searching for $_GET vars
            #    ------------------------
            $_get_vars = '';            
            if(!empty($_GET) || !empty($HTTP_GET_VARS)){
                $_GET = empty($_GET) ? $HTTP_GET_VARS : $_GET;
                foreach ($_GET as $_get_name => $_get_value) {
                    if ($_get_name != "pageNum_Recordset1") {
                        $_get_vars .= "&$_get_name=$_get_value";
                    }
                }
            }
            $successivo = $pageNum_Recordset1+1;
            $precedente = $pageNum_Recordset1-1;
            $firstArray = ($pageNum_Recordset1 > 0) ? "<a href='"$_SERVER[PHP_SELF]?pageNum_Record… :  "$prev_Recordset1";
            # ----------------------
            # page numbers
            # ----------------------
            for($a = $fgp+1; $a <= $egp; $a++){
                $theNext = $a-1;
                if($show_page)
                {
                    $textLink = $a;
                } else {
                    $min_l = (($a-1)*$maxRows_Recordset1) + 1;
                    $max_l = ($a*$maxRows_Recordset1 >= $totalRows_Recordset1) ? $totalRows_Recordset1 : ($a*$maxRows_Recordset1);
                    $textLink = "$min_l - $max_l";
                }
                $_ss_k = floor($theNext/26);
                if ($theNext != $pageNum_Recordset1)
                {
                    $pagesArray .= "<a href='"$_SERVER[PHP_SELF]?pageNum_Record…
                    $pagesArray .= "$textLink</a>" . ($theNext < $egp-1 ? $separator : "");
                } else {
                    $pagesArray .= "$textLink"  . ($theNext < $egp-1 ? $separator : "");
                }
            }
            $theNext = $pageNum_Recordset1+1;
            $offset_end = $totalPages_Recordset1;
            $lastArray = ($pageNum_Recordset1 < $totalPages_Recordset1) ?  "<a href='"$_SERVER[PHP_SELF]?pageNum_Record… : "$next_Recordset1";
        }
    }
    return array($firstArray,$pagesArray,$lastArray…
}
?>
<?php require_once('Connections/theconnect.php… ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }
  $theValue = function_exists("mysql_real_escape_strin… ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
   }
  return $theValue;
}
}
$maxRows_Recordset1 = 5;
$pageNum_Recordset1 = 0;
if (isset($_GET['pageNum_Recordset1'])) {
  $pageNum_Recordset1 = $_GET['pageNum_Recordset1'];
}
$startRow_Recordset1 = $pageNum_Recordset1 * $maxRows_Recordset1;
$colname_Recordset1 = "-1";
if (isset($_GET['textfield'])) {
  $colname_Recordset1 = $_GET['textfield'];
}