PHP实现自动对图片进行滚动显示的方法

发布:smiling　来源: PHP粉丝网　添加日期：2021-05-16 11:59:04　浏览: 评论：0　

这篇文章主要介绍了PHP实现自动对图片进行滚动显示的方法,涉及php操作图片特效的技巧,具有一定参考借鉴价值,需要的朋友可以参考下。

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：

<?

/*

    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>