PHP image slideshow auto

A solid implementation of an image slideshow gallery. Fully automated, no setup needed.

<?
/*
	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);
		$caption = preg_replace('/\.(jpg|jpeg|gif|png)$/i', '', $caption);
		return array($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>

Usage

For a quick setup:

1. Create a folder for the slideshow images.
2. Drop images for the slideshow in the folder.
3. Grab the code, paste it in a file and call it "index.php"
4. Upload this file to a directory that will be the gallery (http://www.site.com/slideshow/)
5. Change lines 6 and 8 to correspond to your setup.
6. Run it (use URL from step 4)

Comments

Posted on 04.02.2010 12:33 by unknown user

A demonstration of what the end result will look like would be nice :)

Posted on 23.01.2010 06:34 by zamg0d1

Can I add this to my own existing site?

Posted on 05.11.2009 12:59 by unknown user

Thanks a lot!

Posted on 29.11.2008 22:07 by unknown user

Not bad

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Coder: steve

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