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PHP实现自动对图片进行滚动显示的方法

本文实例讲述了PHP实现自动对图片进行滚动显示的方法 。分享给大家供大家参考 。具体如下：

指定某个图片目录，该程序自动在页面上滚动展示每一张图片，使用方法：

1. 创建一个幻灯片的图像文件夹 。
2. 删除图像文件夹中的幻灯片 。
3. 将下面代码编码后，粘贴在一个文本文件中，命名为“index.php”
4. 上传文件到一个目录中
5. 更换第6和8行为你对应的设置 。
6. 运行 (使用第4步中设置的URL)

代码如下：

复制代码 代码如下:
<?
/*
    PHP image slideshow - auto version - PHP5
*/
// set the absolute path to the directory containing the images
define (IMGDIR, /home/devel/public_html/domain.com/public/images/slideshow/);
// same but for www
define (WEBIMGDIR, /images/slideshow/);
// set session name for slideshow "cookie"
define (SS_SESSNAME, slideshow_sess);
// global error variable
$err = ;
// start img session
session_name(SS_SESSNAME);
session_start();
// init slideshow class
$ss = new slideshow($err);
if (($err = $ss->init()) != )
{
    header(HTTP/1.1 500 Internal Server Error);
    echo $err;
    exit();
}
// get image files from directory
$ss->get_images();
// set variables, done.
list($curr, $caption, $first, $prev, $next, $last) = $ss->run();
/*
    slideshow class, can be used stand-alone
*/
class slideshow
{
    private $files_arr = NULL;
    private $err = NULL;
    public function __construct(&$err)
    {
        $this->files_arr = array();
        $this->err = $err;
    }
    public function init()
    {
        // run actions only if img array session var is empty
        // check if image directory exists
        if (!$this->dir_exists())
        {
            return Error retrieving images, missing directory;
        }
        return ;
    }
    public function get_images()
    {
        // run actions only if img array session var is empty
        if (isset($_SESSION[imgarr]))
        {
            $this->files_arr = $_SESSION[imgarr];
        }
        else
        {
            if ($dh = opendir(IMGDIR))
            {
                while (false !== ($file = readdir($dh)))
                {
                    if (preg_match(/^.*\.(jpg|jpeg|gif|png)$/i, $file))
                    {
                        $this->files_arr[] = $file;
                    }
                }
                closedir($dh);
            }
            $_SESSION[imgarr] = $this->files_arr;
        }
    }
    public function run()
    {
        $curr = 1;
        $last = count($this->files_arr);
        if (isset($_GET[img]))
        {
            if (preg_match(/^[0-9]+$/, $_GET[img])) $curr = (int)  $_GET[img];
            if ($curr <= 0 || $curr > $last) $curr = 1;
        }
        if ($curr <= 1)
        {
            $prev = $curr;
            $next = $curr + 1;
        }
        else if ($curr >= $last)
        {
            $prev = $last - 1;
            $next = $last;
        }
        else
        {
            $prev = $curr - 1;
            $next = $curr + 1;
        }
        // line below sets the caption name...
        $caption = str_replace(-, , $this->files_arr[$curr - 1]);
        $caption = str_replace(_, , $caption);
        $caption = preg_replace(/\.(jpe?g|gif|png)$/i, , $caption);
        $caption = ucfirst($caption);
        return array($this->files_arr[$curr - 1], $caption, 1, $prev, $next, $last);
    }
    private function dir_exists()
    {
        return file_exists(IMGDIR);
    }
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Slideshow</title>
    <style type="text/css">
    body{margin: 0;padding: 0;font: 100% Verdana, Arial, Helvetica, sans-serif;font-size: 14px;}
    div#gallery{border: 1px #ccc solid;width: 600px;margin: 40px auto;text-align: center;}
    div#gallery img{margin: 20px;border: 2px #004694 solid;}
    div#gallery p{color: #004694;}
    div#gallery div.pn{padding: 10px;margin: 0 5px;border-top: 1px #ccc solid;}
    a{color:#333;}
    a:hover{color:#cc0000;}
    a.sp{padding-right: 40px;}
    </style>
</head>
<body>
    <div id="gallery">
        <img src="<?=WEBIMGDIR;?><?=$curr;?>" alt="" />
        <p><?=$caption;?></p>
        <div class="pn">
            <a href="?img=<?=$first;?>">First</a> | <a href="?img=<?=$prev;?>" class="sp">Previous</a><a href="?img=<?=$next;?>">Next</a> | <a href="?img=<?=$last;?>">Last</a>
        </div>
    </div>
</body>
</html>

希望本文所述对大家的php程序设计有所帮助 。