PHP实现自动对图片进行滚动显示的方法

2020-03-22 17:58:35

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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/html' target='_blank'>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
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。PHP教程

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