分页结果出错

时间:2013-05-20 15:14:32

标签: php pagination

我的php脚本上有这个代码用于分页

<?php
session_start();
//Database stuff here
$image = $_SESSION['image'];
$cat = $_GET['cate'];
$pagenum = $_GET['pagenum'];
//PAGING BEGINS
if(!isset($pagenum)){
    $pagenum = 1;
}

$data = mysql_query("SELECT * FROM tbl_product WHERE category = '$cat'");
$rows = mysql_num_rows($data);
$page_rows = 4;
$last = ceil($rows/$page_rows);

if($pagenum < 1)
    $pagenum = 1;
elseif($pagenum > $last)
    $pagenum = $last;

$max = 'limit '.($pagenum - 1) * $page_rows.','.$page_rows;
$data_p = mysql_query("SELECT * FROM tbl_product WHERE category = '$cat' $max");

while($row = mysql_fetch_array($data_p)) {
    echo $row[1];
    echo $row[2];
}

echo "<p>";
echo "--Page $pagenum of Last </p>";

if($pagenum == 1){
} else {
    echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=1'>First</a>";
    echo "";
    $previous = $pagenum - 1;
    echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=$previous'><-Previous</a>";
}

if($pagenum == $last){
} else {
    $next = $pagenum + 1;
    echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=$next'>Next ->></a>";
    echo "";
    echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=$last'>Last</a>";
}
?>

当我运行它时,第一页显示指定的4项,但是当我单击“下一步”时,$ pagenum变量变为0,导致限制($ max)的负范围,因此出现SQL错误。我不知道为什么。我已经尝试了几个分页脚本,最终出现了同样的错误。当我尝试移动到下一页时,$ pagenum变为0。请问我的错误是什么?谢谢

1 个答案:

答案 0 :(得分:2)

想想我知道这个问题,你有:

echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=$last'>Last</a>";

问题可能是$_SERVER['PHP_SELF']返回index.php然后你在?pagenum=1添加,因此你得到的网址是:

/index.php?pagenum=1

所以你丢失了你的类别变量。尝试将所有链接更改为以下内容:

echo "<a href='{$_SERVER['PHP_SELF']}?pagenum=$last&cate=$cat'>Last</a>";