这个分页脚本是 doodoo - 我需要一个更好的！

Question

我正在查看分页脚本（发布在下面），发现它很糟糕，而且一点也不太好，尤其是在尝试自定义它时。

这是主页的样子：

<?php
include('config.php');
$per_page = 9;

//Calculating no of pages
$sql = "select * from messages";
$result = mysql_query($sql);
$count = mysql_num_rows($result);
$pages = ceil($count/$per_page)
?>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/
libs/jquery/1.3.0/jquery.min.js"></script>
<script type="text/javascript" src="jquery_pagination.js"></script>

<div id="loading" ></div>
<div id="content" ></div>
<ul id="pagination">
<?php
//Pagination Numbers
for($i=1; $i<=$pages; $i++)
{
echo '<li id="'.$i.'">'.$i.'</li>';
}
?>
</ul>

代码的顶部从 mysql db 中获取结果，然后使用此信息在此页面的正文中显示数字。

我正在尝试将这样的内容放在单独的页面上，例如 count_page.php，然后将其包含在内。

我想我的问题是，如果有更好的方法来做上述更好的结构。一种更好的方法来遍历数据库并计算结果并显示适当的数字。上面看起来很乱。

感谢您对此的任何帮助或建议。

Answer 1

这是一个非常有用的分页类。 很简单，你会明白的，我确定

class PS_Pagination {
    var $php_self;
    var $rows_per_page = 10; //Number of records to display per page
    var $total_rows = 0; //Total number of rows returned by the query
    var $links_per_page = 5; //Number of links to display per page
    var $append = ""; //Paremeters to append to pagination links
    var $sql = "";
    var $debug = false;
    var $conn = false;
    var $page = 1;
    var $max_pages = 0;
    var $offset = 0;

    /**
     * Constructor
     *
     * @param resource $connection Mysql connection link
     * @param string $sql SQL query to paginate. Example : SELECT * FROM users
     * @param integer $rows_per_page Number of records to display per page. Defaults to 10
     * @param integer $links_per_page Number of links to display per page. Defaults to 5
     * @param string $append Parameters to be appended to pagination links 
     */

    function PS_Pagination($connection, $sql, $rows_per_page = 10, $links_per_page = 5, $append = "") {
        $this->conn = $connection;
        $this->sql = $sql;
        $this->rows_per_page = (int)$rows_per_page;
        if (intval($links_per_page ) > 0) {
            $this->links_per_page = (int)$links_per_page;
        } else {
            $this->links_per_page = 5;
        }
        $this->append = $append;
        $this->php_self = htmlspecialchars($_SERVER['PHP_SELF'] );
        if (isset($_GET['page'] )) {
            $this->page = intval($_GET['page'] );
        }
    }

    /**
     * Executes the SQL query and initializes internal variables
     *
     * @access public
     * @return resource
     */
    function paginate() {
        //Check for valid mysql connection
        if (! $this->conn || ! is_resource($this->conn )) {
            if ($this->debug)
                echo "MySQL connection missing<br />";
            return false;
        }

        //Find total number of rows
        $all_rs = @mysql_query($this->sql );
        if (! $all_rs) {
            if ($this->debug)
                echo "SQL query failed. Check your query.<br /><br />Error Returned: " . mysql_error();
            return false;
        }
        $this->total_rows = mysql_num_rows($all_rs );
        @mysql_close($all_rs );

        //Return FALSE if no rows found
        if ($this->total_rows == 0) {
            if ($this->debug)
                echo "Query returned zero rows.";
            return FALSE;
        }

        //Max number of pages
        $this->max_pages = ceil($this->total_rows / $this->rows_per_page );
        if ($this->links_per_page > $this->max_pages) {
            $this->links_per_page = $this->max_pages;
        }

        //Check the page value just in case someone is trying to input an aribitrary value
        if ($this->page > $this->max_pages || $this->page <= 0) {
            $this->page = 1;
        }

        //Calculate Offset
        $this->offset = $this->rows_per_page * ($this->page - 1);

        //Fetch the required result set
        $rs = @mysql_query($this->sql . " LIMIT {$this->offset}, {$this->rows_per_page}" );
        if (! $rs) {
            if ($this->debug)
                echo "Pagination query failed. Check your query.<br /><br />Error Returned: " . mysql_error();
            return false;
        }
        return $rs;
    }

    /**
     * Display the link to the first page
     *
     * @access public
     * @param string $tag Text string to be displayed as the link. Defaults to 'First'
     * @return string
     */
    function renderFirst($tag = 'First') {
        if ($this->total_rows == 0)
            return FALSE;

        if ($this->page == 1) {
            return "$tag ";
        } else {
            return '<a href="' . $this->php_self . '?page=1&' . $this->append . '">' . $tag . '</a> ';
        }
    }

    /**
     * Display the link to the last page
     *
     * @access public
     * @param string $tag Text string to be displayed as the link. Defaults to 'Last'
     * @return string
     */
    function renderLast($tag = 'Last') {
        if ($this->total_rows == 0)
            return FALSE;

        if ($this->page == $this->max_pages) {
            return $tag;
        } else {
            return ' <a href="' . $this->php_self . '?page=' . $this->max_pages . '&' . $this->append . '">' . $tag . '</a>';
        }
    }

    /**
     * Display the next link
     *
     * @access public
     * @param string $tag Text string to be displayed as the link. Defaults to '>>'
     * @return string
     */
    function renderNext($tag = '&gt;&gt;') {
        if ($this->total_rows == 0)
            return FALSE;

        if ($this->page < $this->max_pages) {
            return '<a href="' . $this->php_self . '?page=' . ($this->page + 1) . '&' . $this->append . '">' . $tag . '</a>';
        } else {
            return $tag;
        }
    }

    /**
     * Display the previous link
     *
     * @access public
     * @param string $tag Text string to be displayed as the link. Defaults to '<<'
     * @return string
     */
    function renderPrev($tag = '&lt;&lt;') {
        if ($this->total_rows == 0)
            return FALSE;

        if ($this->page > 1) {
            return ' <a href="' . $this->php_self . '?page=' . ($this->page - 1) . '&' . $this->append . '">' . $tag . '</a>';
        } else {
            return " $tag";
        }
    }

    /**
     * Display the page links
     *
     * @access public
     * @return string
     */
    function renderNav($prefix = '<span class="page_link">', $suffix = '</span>') {
        if ($this->total_rows == 0)
            return FALSE;

        $batch = ceil($this->page / $this->links_per_page );
        $end = $batch * $this->links_per_page;
        if ($end == $this->page) {
            //$end = $end + $this->links_per_page - 1;
        //$end = $end + ceil($this->links_per_page/2);
        }
        if ($end > $this->max_pages) {
            $end = $this->max_pages;
        }
        $start = $end - $this->links_per_page + 1;
        $links = '';

        for($i = $start; $i <= $end; $i ++) {
            if ($i == $this->page) {
                $links .= $prefix . " $i " . $suffix;
            } else {
                $links .= ' ' . $prefix . '<a href="' . $this->php_self . '?page=' . $i . '&' . $this->append . '">' . $i . '</a>' . $suffix . ' ';
            }
        }

        return $links;
    }

    /**
     * Display full pagination navigation
     *
     * @access public
     * @return string
     */
    function renderFullNav() {
        return $this->renderFirst() . '&nbsp;' . $this->renderPrev() . '&nbsp;' . $this->renderNav() . '&nbsp;' . $this->renderNext() . '&nbsp;' . $this->renderLast();
    }

    /**
     * Set debug mode
     *
     * @access public
     * @param bool $debug Set to TRUE to enable debug messages
     * @return void
     */
    function setDebug($debug) {
        $this->debug = $debug;
    }
}