我的脚本代码搜索与分页，工作！ 但是当我单击下一页时，服务器会写此错误：
注意：未定义的索引：c：''xampp''htdocs''php''search.php 中的 byidaifa 129路
注意：未定义的索引：c：''xampp''htdocs''php''search.php 中的 byidaifa 147路
注意：未定义的索引：c：''xampp''htdocs''php''search.php 中的 byidaifa 187路
"byidaifa"是 mysql 中 IDAIFA 上的 INT 数字。好像它必须保持空白！
错误在哪里？
非常感谢！
<?php
include('conn.php');
session_start();
$_SESSION['byidaifa']=$_REQUEST['byidaifa'];
$_SESSION['bynome']=$_REQUEST ['bynome'];
$_SESSION['bycognome']=$_REQUEST ['bycognome'];
$_SESSION['bytipologia']=$_REQUEST ['bytipologia'];
$_SESSION['bymarca']=$_REQUEST ['bymarca'];
$_SESSION['bymodello']=$_REQUEST ['bymodello'];
$_SESSION['bystato']=$_REQUEST ['bystato'];
$_SESSION['bysoftware']=$_REQUEST ['bysoftware'];
$limit = 50;
$count = "SELECT COUNT(*) as num FROM asset WHERE ID ";
if($_REQUEST['byidaifa'])
$count = $count . " AND IDAIFA LIKE '".$_SESSION['byidaifa']."' ";
if($_REQUEST ['bynome'])
$count = $count . " AND Nome LIKE '".$_SESSION['bynome']."' ";
if($_REQUEST ['bycognome'])
$count = $count . " AND Cognome LIKE '".$_SESSION['bycognome']."' ";
if($_REQUEST ['bytipologia'])
$count = $count . " AND Tipologia LIKE '".$_SESSION['bytipologia']."' ";
if($_REQUEST ['bymarca'])
$count = $count . " AND Marca LIKE '".$_SESSION['bymarca']."' ";
if($_REQUEST ['bymodello'])
$count = $count . " AND Modello LIKE '".$_SESSION['bymodello']."' ";
if($_REQUEST ['bystato'])
$count = $count . " AND Stato LIKE '".$_SESSION['bystato']."' ";
if($_REQUEST ['bysoftware'])
$count = $count . " AND Software LIKE '".$_SESSION['bysoftware']."' ";
$resultcount = mysql_query($count);
$total_pages = mysql_fetch_array(mysql_query($count));
$total_pages = $total_pages['num'];
$stages = 3;
$page = isset($_GET['page']) ? mysql_real_escape_string($_GET['page']) : 0;
if($page){
$start = ($page - 1) * $limit;
}else{
$start = 0;
}
$querysearch = "SELECT * FROM asset WHERE ID ";
if($_REQUEST['byidaifa'])
$querysearch = $querysearch . " AND IDAIFA LIKE '".$_SESSION['byidaifa']."' ";
if($_REQUEST ['bynome'])
$querysearch = $querysearch . " AND Nome LIKE '".$_SESSION['bynome']."' ";
if($_REQUEST ['bycognome'])
$querysearch = $querysearch . " AND Cognome LIKE '".$_SESSION['bycognome']."' ";
if($_REQUEST ['bytipologia'])
$querysearch = $querysearch . " AND Tipologia LIKE '".$_SESSION['bytipologia']."' ";
if($_REQUEST ['bymarca'])
$querysearch = $querysearch . " AND Marca LIKE '".$_SESSION['bymarca']."' ";
if($_REQUEST ['bymodello'])
$querysearch = $querysearch . " AND Modello LIKE '".$_SESSION['bymodello']."' ";
if($_REQUEST ['bystato'])
$querysearch = $querysearch . " AND Stato LIKE '".$_SESSION['bystato']."' ";
if($_REQUEST ['bysoftware']){
$querysearch = $querysearch . " AND Software LIKE '".$_SESSION['bysoftware']."' ";
}
$querysearch = $querysearch . " LIMIT $start, $limit ";
$resultsearch = mysql_query($querysearch);
if(isset($_REQUEST))
{
unset($_REQUEST['page']);
$querysearch = http_build_query($_REQUEST);
}
// Initial page num setup
if ($page == 0){$page = 1;}
$prev = $page - 1;
$next = $page + 1;
$lastpage = ceil($total_pages/$limit);
$LastPagem1 = $lastpage - 1;
$paginate = '';
if($lastpage > 1)
{
$paginate .= "<div class='paginate'>";
// Previous
if ($page > 1){
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$prev'>Prev</a> ";
}else{
$paginate.= "<span class='disabled'>previous</span>"; }
// Pages
if ($lastpage < 7 + ($stages * 2))
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$counter'>$counter</a>";}
}
}
elseif($lastpage > 5 + ($stages * 2))
{
if($page < 1 + ($stages * 2))
{
for ($counter = 1; $counter < 4 + ($stages * 2); $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$counter'>$counter</a>";}
}
$paginate.= "...";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$LastPagem1'>$LastPagem1</a>";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$lastpage'>$lastpage</a>";
}
elseif($lastpage - ($stages * 2) > $page && $page > ($stages * 2))
{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=1'>1</a>";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=2'>2</a>";
$paginate.= "...";
for ($counter = $page - $stages; $counter <= $page + $stages; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$counter'>$counter</a>";}
}
$paginate.= "...";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$LastPagem1'>$LastPagem1</a>";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$lastpage'>$lastpage</a>";
}
else
{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=1'>1</a>";
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=2'>2</a>";
$paginate.= "...";
for ($counter = $lastpage - (2 + ($stages * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$counter'>$counter</a>";}
}
}
}
// Next
if ($page < $counter - 1){
$paginate.= "<a href='search.php?search=$querysearch&submit=Go&page=$next'>next</a>";
}else{
$paginate.= "<span class='disabled'>next</span>";
}
$paginate.= "</div>";
}
echo $total_pages.' Results';
// pagination
echo "<table border='1' style='margin:0 auto;'>";
echo "<tr>",
"<td colspan='3'> Azioni </td> <td> Nome </td> <td> Cognome </td> <td> IDAIFA </td> <td> Utilizzo</td> <td> Tipologia</td> <td>Marca</td> <td>Modello</td> <td>Stato</td>",
"</tr> 'n";
if ($resultsearch)
while($dati = mysql_fetch_assoc($resultsearch))
{
echo "<tr>";
echo "<td> <a href='detailasset.php?ID=$dati[ID]'><img src='../images/eye.png'></a> </td>";
echo "<td> <a href='modasset.php?ID=$dati[ID]'><img src='../images/edit.png'></a> </a> </td>";
echo "<td> <a href='deleteasset.php?ID=$dati[ID]?confirm=true' class='confirm'> <img src='../images/delete.png'></a></td>";
print "<td> $dati[Nome] </td>";
print "<td> $dati[Cognome] </td>";
print "<td> $dati[IDAIFA] </td>";
print "<td> $dati[Utilizzo] </td>";
print "<td> $dati[Tipologia] </td>";
print "<td> $dati[Marca] </td>";
print "<td> $dati[Modello] </td>";
print "<td> $dati[Stato] </td>";
print "<td> $dati[Software] </td>";
echo "</tr> 'n";
}
echo "</table></div>'n";
echo $paginate;
?>
如果您不确定是否会设置变量，请在调用之前检查它是否已设置，例如：
if(isset($_REQUEST['byidaifa']){
$_SESSION['byidaifa']=$_REQUEST['byidaifa'];
}
else{
$_SESSION['byidaifa'] = '';
}
听起来您的请求中不存在 byidaifa。不要使用 if($_REQUEST ['byidaifa']) ，请使用 if(!empty($_REQUEST ['byidaifa'])) 来确保它存在于请求中并保存的值不是 NULL 或 FALSE。对其他if($_REQUEST)执行相同的操作，以确保这些错误不会再次弹出
在尝试访问它们之前，您需要测试$_REQUEST参数是否定义/不为空。您可以使用 isset 或空函数执行此操作。
$_SESSION['byidaifa']= (isset($_REQUEST['byidaifa']) ) ? $_REQUEST['byidaifa'] : NULL;
后 if(is_null($_SESSION['byidaifa']) === false ) [...]
您确实应该清理输入并使用mysqli或PDO来访问数据库，因为mysql函数已被弃用。目前，您的代码容易受到 SQL 注入的影响。