Tuesday 2 June 2015

PHP image slideshow auto 

<?php
/*
 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>
 
 

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)
 

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