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标题 PHP实现自动对图片进行滚动显示的方法
内容
    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:
    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, $last);
    }
    private function dir_exists()
    {
    return file_exists(IMGDIR);
    }
    }
    ?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
    <html xmlns="">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Slideshow</title>
    <style type="text/css">
    body{margin: 0;padding: 0;font: 100% Verdana, Arial, Helvetica, sans-serif;font-size: 14px;}
    div#gallery{border: 1px #ccc solid;width: 600px;margin: 40px auto;text-align: center;}
    div#gallery img{margin: 20px;border: 2px #004694 solid;}
    div#gallery p{color: #004694;}
    div#gallery div.pn{padding: 10px;margin: 0 5px;border-top: 1px #ccc solid;}
    a{color:#333;}
    a:hover{color:#cc0000;}
    a.sp{padding-right: 40px;}
    </style>
    </head>
    <body>
    <div id="gallery">
    <img src="<?=WEBIMGDIR;?><?=$curr;?>" />
    <p><?=$caption;?></p>
    <div>
    <a href="?img=<?=$first;?>">First</a> | <a href="?img=<?=$prev;?>">Previous</a><a href="?img=<?=$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。
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更新时间:2025/5/20 0:29:17