Question

好的，我会在这里粘贴我的代码，就像一个人选择一个类别，然后他登陆另一个页面，现在问题是因为mysql_fetch_rows选择所有类别的所有行，所以如果有10个条目，每个类别5，如果我设置为每页显示1个帖子而不是显示5个页面，它显示10个页面，但在第5页后，我得到一个PHP错误。谢谢你，这是我的代码

$pagination_shoot = "SELECT id, po_title, po_category FROM tbl_posts WHERE po_category = '{$category}'";

$page_dump = mysql_query($pagination_shoot, $db_connect);

$no_rows = mysql_fetch_row($page_dump);

$numrows = $no_rows[0];

$rows_per_page = 1;

$lastpage = ceil($numrows/$rows_per_page);

$page = (int)$page;

if ($page > $lastpage) {
$page = $lastpage;
} // if

if ($page < 1) {
$page = 1;
} // if

$limit = 'LIMIT ' .($page - 1) * $rows_per_page .',' .$rows_per_page;

//Run Post Query
$data_posts = "SELECT id, po_title, po_category FROM tbl_posts WHERE po_category = '{$category}' {$limit}"; //Post Query

$fetch_data_posts = mysql_query($data_posts, $db_connect);

while ($list_posts = mysql_fetch_array($fetch_data_posts))

Answer 1

在行之间阅读，我认为你要做的是从该数据库中获取特定页面的结果，同时知道总共有多少结果，这样你就可以计算出会有多少页面。以下是使用SQL_CALC_FOUND_ROWS：

执行此操作的正确方法

// Populate these variables however you see fit (eg through $_GET)
$rows_per_page = 1;
$current_page = 1;

// -----------

// Make sure the page number is >= 1
$current_page = (int) $current_page;
if ($current_page < 1) $current_page = 1;

// Calculate values for LIMIT clause
$limitQty = (int) $rows_per_page;
$limitBase = ($current_page - 1) * $limitQty;


// Run the query
$query = "
  SELECT SQL_CALC_FOUND_ROWS
    `id`, `po_title`, `po_category`
  FROM `tbl_posts`
  WHERE `po_category` = '".mysql_real_escape_string($category, $db_connect)."'
  LIMIT $limitBase, $limitQty
";
$result = mysql_query($query, $db_connect);

// Store the results in an array and free the MySQL resource
$data_posts = array();
while ($row = mysql_fetch_array($result)) {
  $data_posts[] = $row;
}
mysql_free_result($result);

// Get the total number of rows
$query = "
  SELECT FOUND_ROWS()
";
$result = mysql_query($query, $db_connect);
$numrows = mysql_fetch_row($result);
$total_rows = $numrows[0];
mysql_free_result($result);

// Calculate the total number of pages
$total_pages = ceil($total_rows / $rows_per_page);

if ($current_page > $total_pages) {
  // Handle a request that asked for a page which is greater than the total number of pages
  // You could display an error message, redirect to a page within range, or run another query
  // to fetch the rows for the last page.
}

// Now you can loop the data results and do whatever you want with them
foreach ($data_posts as $list_posts) {
  // ...
}

用于分页的PHP变量值

1 个答案: