php mysql过滤的分页结果在下一页上不起作用

Question

美好的一天。我需要你的专家意见。我一直在使用来自 mysql 的过滤结果进行分页。

过滤后的结果仅适用于第一页。单击下一页或后续页面，出现以下错误，它还显示数据库中的所有数据。

Notice: Undefined index: search Notice: Undefined index: position Notice: Undefined index: dept Notice: Undefined index: bldg and so on...

我想知道我可能会遗漏什么......

这里是更新后的代码:

<?php
    include('include/connect.php'); 

    $tableName="employee";      
    $targetpage = "searchresults.php";  
    $limit = 5; 


    $search = mysql_real_escape_string($_GET['search']);
    $position = mysql_real_escape_string($_GET['position']);
    $dept = mysql_real_escape_string($_GET['dept']);
    $bldg = mysql_real_escape_string($_GET['bldg']);

    $query = "SELECT COUNT(*) as num FROM $tableName WHERE name like '%{$search}%' AND position like '%{$position}%' AND dept like '%{$dept}%' AND bldg like '%{$bldg}%'";
    $total_pages = mysql_fetch_array(mysql_query($query));
    $total_pages = $total_pages['num'];

    $stages = 3;



    //  $page = mysql_escape_string($_GET['page']);


    $page = isset($_GET['page']) ? mysql_real_escape_string($_GET['page']) : 0;



    if($page){          
        $start = ($page - 1) * $limit; 
    }else {
        $start = 0; 
    }

    // Get page data

    $query1 = "SELECT * FROM $tableName WHERE ads like '%{$search}%' AND position like '%{$position}%' AND dept like '%{$dept}%' AND bldg like '%{$bldg}%' ORDER BY dateposted DESC LIMIT $start, $limit";
    $result = mysql_query($query1);

    // 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){
            $paginate.= "<a href='$targetpage?page=$prev'>previous</a>";
        }else{
            $paginate.= "<span class='disabled'>previous</span>";   }



        // Pages    
        if ($lastpage < 7 + ($stages * 2))  // Not enough pages to breaking it up
        {   
            for ($counter = 1; $counter <= $lastpage; $counter++)
            {
                if ($counter == $page){
                    $paginate.= "<span class='current'>$counter</span>";
                }else{
                    $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}                    
            }
        }
        elseif($lastpage > 5 + ($stages * 2))   // Enough pages to hide a few?
        {
            // Beginning only hide later pages
            if($page < 1 + ($stages * 2))       
            {
                for ($counter = 1; $counter < 4 + ($stages * 2); $counter++)
                {
                    if ($counter == $page){
                        $paginate.= "<span class='current'>$counter</span>";
                    }else{
                        $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}                    
                }
                $paginate.= "...";
                $paginate.= "<a href='$targetpage?page=$LastPagem1&search=$search&position=$position&dept=$dept&‌​bldg=$bldg''>$LastPagem1</a>";
                $paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";       
            }
            // Middle hide some front and some back
            elseif($lastpage - ($stages * 2) > $page && $page > ($stages * 2))
            {
                $paginate.= "<a href='$targetpage?page=1'>1</a>";
                $paginate.= "<a href='$targetpage?page=2'>2</a>";
                $paginate.= "...";
                for ($counter = $page - $stages; $counter <= $page + $stages; $counter++)
                {
                    if ($counter == $page){
                        $paginate.= "<span class='current'>$counter</span>";
                    }else{
                        $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}                    
                }
                $paginate.= "...";
                $paginate.= "<a href='$targetpage?page=$LastPagem1&search=$search&position=$position&dept=$dept&‌​bldg=$bldg'>$LastPagem1</a>";
                $paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";       
            }
            // End only hide early pages
            else
            {
                $paginate.= "<a href='$targetpage?page=1'>1</a>";
                $paginate.= "<a href='$targetpage?page=2'>2</a>";
                $paginate.= "...";
                for ($counter = $lastpage - (2 + ($stages * 2)); $counter <= $lastpage; $counter++)
                {
                    if ($counter == $page){
                        $paginate.= "<span class='current'>$counter</span>";
                    }else{
                        $paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}                    
                }
            }
        }

                // Next
        if ($page < $counter - 1){ 
            $paginate.= "<a href='$targetpage?page=$next'>next</a>";
        }else{
            $paginate.= "<span class='disabled'>next</span>";
            }

        $paginate.= "</div>";       


}
 echo $total_pages.' Results';
 // pagination
 echo $paginate;

?>

<ul>

<?php 

        echo "<table id='t01' border='5' style='width:100%' align='center'>";

                echo "<tr>";                                 
                    echo "<th>NAME</th>";
            echo "<th>CONTACT</th>";
            echo "<th>DEPT</th>";
            echo "<th>BLDG</th>";   
            echo "<th>POSITION</th>";   
                    echo "<th>COMMENT</th>";

                echo "</tr>";




        while($row = mysql_fetch_array($result))
        {

        // echo '<li>'.$row['user'].'</li>';

        echo "<tr>";                    

                    echo "<td>" . $row['user'] . "</td>";

            echo "<td>" . $row['contact'] . "</td>";

            echo "<td>" . $row['dept'] . "</td>";   

            echo "<td>" . $row['bldg'] . "</td>";

            echo "<td>" . $row['position'] . "</td>";   

                    echo "<td>" . $row['comment'] . "</td>";


                echo "</tr>";







        }





    ?>

Answer 1

当您创建分页链接时，您没有在创建的链接中添加查询参数，这就是当您转到下一页时缺少参数的原因。

所以无论你在哪里创建这样的分页链接

$paginate.= "<a href='$targetpage?page=$LastPagem1'>$LastPagem1</a>";

与页码一起添加搜索的参数。例如(添加搜索项)

$paginate.= "<a href='$targetpage?page=$LastPagem1&search=$search'>$LastPagem1</a>";

除此之外，您似乎正在从 $_POST 变量获取数据，现在当您在链接上添加参数时，您必须通过 $_GET 获取它们喜欢

$_GET['search']等等……

并且假设第一次进行搜索时，它是使用 method="post" 发送的在表格上，您也可以将其更改为 method="get"如果这适合您的用例。

更新:

您需要将查询参数添加到所有链接，而不仅仅是在一个地方。

所以您首先可以做的是创建一个已连接所有查询参数的变量

$params = "&search=$search&position=$position&dept=$dept&‌​bldg=$bldg";

然后在任何你有代码的地方写类似的东西

<a href='$targetpage?page=$LastPagem1'>

在此处添加 params 变量，例如:

<a href='$targetpage?page=$LastPagem1{$params}'>

请记住，这需要在代码中传递 ?page= 的所有地方完成或者为了测试只检查您更新的链接。