ShowPhoto.php - Simple Slid Show Script

PHP Tutorials - Herong's Tutorial Examples

∟Functions to Manage Directories, Files and Images

∟ShowPhoto.php - Simple Slid Show Script

This section provides a tutorial example on how to display image files in a directory in a slide show format. The getimagesize() function is used to retrieve image sizes from image files.

Another nice function for image file management is the "get image size" function, getimagesize($path), which returns the size and other information about the image stored in a file located at $path.

To show you how to use this getimagesize() function, I wrote the following sample script:

<?php
#  PhotoShow.php
#- Copyright 2009-2015 (c) HerongYang.com. All Rights Reserved.
#
#- Get the photo file name
   $i = intval($_GET['i']);
   $c = 0;
   $p = "";
   if ($d = opendir(".")) {
      while (($f = readdir($d)) != false) {
         if (preg_match('/.jpg$/',$f)) {
            if ($i==$c) {
               $p = $f;
            }
            $c++;
         }
      }
      closedir($d);
    }

#- Build the page
   $h = fopen("header.html", "r");
   $s = fread($h, filesize("header.html"));
   fclose($h);
   print "$s\n";

   if (strlen($p)>0) {
      $i1 = ($i+$c-1) % $c;
      $i2 = ($i+$c+1) % $c;
      list($width, $height, $type, $attr) = getimagesize($p);
      if ($width>700) {
         $width = $width/2;
         $height = $height/2;
      }
      print "<center><a href=\"ShowPhoto.php?i=$i1\"><=</a>&nbsp;"
         ."<a href=\"ShowPhoto.php?i=$i2\">=></a></center>\n"
         ."<center><img src=\"$p\" border=\"1\" width=\"$width\" "
         ."height=\"$height\"></center><br\>\n"
         ."<center><a href=\"ShowPhoto.php?i=$i1\"><=</a>&nbsp;"
         ."<a href=\"ShowPhoto.php?i=$i2\">=></a></center>\n";
   } else {
      print "<p>Wrong URL. Please go back to the home page.</p>\n";
   }

   $h = fopen("footer.html", "r");
   $s = fread($h, filesize("footer.html"));
   fclose($h);
   print "$s\n";
?>