The script (below) looks for jpgs in the 'images' sub-folder. For each
jpg, it
writes an XML tag, then creates a thumbnail image in the 'thumbs'
sub-folder.
Images are created using the GD imaging library. If the server is using GD
version 2, the script will use the 'imagecopyresampled' function to create
higher quality thumbnails.
If the server has GD v1, the script works. If the server has GD v2, the
script does not create any thumbnails. Any ideas why not?
<?php
// -----------------------
// buildgallery.php
// -----------------------
// DESCRIPTION
// -----------------------
// This script automatically generates the XML document and thumbnails.
//
// TO USE
// -----------------------
//
// SET GALLERY OPTIONS HERE
// -----------------------
// Set Gallery options by editing this text:
$options .= '<SIMPLEVIEWER_DATA maxImageDimension="480" textColor="0xFFFFFF" frameColor="0xFFFFFF" bgColor="0x181818" frameWidth="20" stagePadding="40" thumbnailColumns="3" thumbnailRows="3" navPosition="right" navDirection="LTR" title="Example Title" imagePath="" thumbPath="">';
// Set showDownloadLinks to true if you want to show a 'Download Image' link as the caption to each image.
$showDownloadLinks = false;
// END OF OPTIONS
// -----------------------
print "Creating XML and thumbnails.<br>";
print "-------------------------------------------------<br><br>";
//Get GD imaging library info
$tgdInfo = getGDversion();
print "GD version: ".tgdInfo;
if ($tgdInfo == 0){
print "Note: The GD imaging library was not found on this Server. Thumbnails will not be created. Please contact your web server administrator.<br><br>";
}
if ($tgdInfo < 2){
print "Note: The GD imaging library is version ".$tgdInfo." on this server. Thumbnails will be reduced quality. Please contact your web server administrator to upgrade GD version to 2.0.1 or later.<br><br>";
}
//loop thru images
$xml = '<?xml version="1.0" encoding="UTF-8" ?>'.$options;
$folder = opendir("images");
while($file = readdir($folder)) {
if ($file[0] != "." && $file[0] != ".." ) {
$files[$file] = filemtime("images/$file");
}
}
// now sort by date modified
arsort($files);
foreach($files as $key => $value) {
$xml .= '
<IMAGE>';
$xml .= '<NAME>'.$key.'</NAME>';
//add auto captions: 'Image X'
if ($showDownloadLinks){
$xml .= '<CAPTION><![CDATA[<A href="images/'.$key.'" target="_blank"><U>Open image in new window</U></A>]]></CAPTION>';
}else{
$xml .= '<CAPTION></CAPTION>';
}
$xml .= '</IMAGE>';
print "- Created Image Entry for: $key<br>";
if (!file_exists("./thumbs/".$key)){
if (createThumb($key)){
print "- Created Thumbnail for: $key<br>";
}
}
}
closedir($folder);
$xml .= '</SIMPLEVIEWER_DATA>';
$file = "imageData.xml";
if (!$file_handle = fopen($file,"w")) {
print "<br>Cannot open XML document: $file<br>";
} elseif (!fwrite($file_handle, $xml)) {
print "<br>Cannot write to XML document: $file<br>";
}else{
print "<br>Successfully created XML document: $file<br>";
}
fclose($file_handle);
// }}}
// {{{ createThumb()
/**
* Create a squared thumbnail from an existing image.
*
* @param string $file Location and name where the file is stored .
* @return boolean
* @access public
* @author Christian Machmeier
*/
function createThumb($fileName)
{
// Get information about the installed GD.
$gdVersion = getGDversion();
if ($gdVersion == 0) {
return false;
}
$file = 'images/'.$fileName;
$fileDest = 'thumbs/'.$fileName;
// Get the image dimensions.
$dimensions = @getimagesize($file);
$width = $dimensions[0];
$height = $dimensions[1];
$outputX = 45;
$outputY = 45;
$quality = 85;
// The image is of vertical shape.
if ($width < $height) {
$deltaX = 0;
$deltaY = ($height - $width) / 2;
$portionX = $width;
$portionY = $width;
// The image is of horizontal shape.
} else if ($width > $height) {
$deltaX = ($width - $height) / 2;
$deltaY = 0;
$portionX = $height;
$portionY = $height;
// The image is of squared shape.
} else {
$deltaX = 0;
$deltaY = 0;
$portionX = $width;
$portionY = $height;
}
$imageSrc = @imagecreatefromjpeg($file);
// The thumbnail creation with GD1.x functions does the job.
if ($gdVersion < 2) {
// Create an empty thumbnail image.
$imageDest = @imagecreate($outputX, $outputY);
// Try to create the thumbnail from the source image.
if (@imagecopyresized($imageDest, $imageSrc, 0, 0, $deltaX, $deltaY, $outputX, $outputY, $portionX, $portionY)) {
// save the thumbnail image into a file.
@imagejpeg($imageDest, $fileDest, $quality);
// Delete both image resources.
@imagedestroy($imageSrc);
@imagedestroy($imageDest);
return true;
}
} else {
// The recommended approach is the usage of the GD2.x functions.
// Create an empty thumbnail image.
$imageDest = @imagecreatetruecolor($outputX, $outputY);
// Try to create the thumbnail from the source image.
if (@imagecopyresampled($imageDest, $imageSrc, 0, 0, $deltaX, $deltaY, $outputX, $outputY, $portionX, $portionY)) {
// save the thumbnail image into a file.
@imagejpeg($imageDest, $fileDest, $quality);
// Delete both image resources.
@imagedestroy($imageSrc);
@imagedestroy($imageDest);
return true;
}
}
return false;
}
function getGDversion() {
static $gd_version_number = null;
if ($gd_version_number === null) {
// Use output buffering to get results from phpinfo()
// without disturbing the page we're in. Output
// buffering is "stackable" so we don't even have to
// worry about previous or encompassing buffering.
ob_start();
phpinfo(8);
$module_info = ob_get_contents();
ob_end_clean();
if (preg_match("/\bgd\s+version\b[^\d\n\r]+?([\d\.]+)/i",
$module_info,$matches)) {
$gd_version_number = $matches[1];
} else {
$gd_version_number = 0;
}
}
return $gd_version_number;
}
?>
