PHP - Thumbnail Making Script

Any one know a tutorial for an easy to use thumbnail script which I can use with pictures stored in mysql database.

I have a quick question about a script I wrote that searches all .jpg images in a directory (and it's sub-directories) and makes thumbnails of them. The problem I am having is that I am getting an internal server error after about 15 seconds. I have included my script, the class it requires, and my php.ini file that resides in the root of my site. I have searched for a couple of hours online and haven't been able to come up with an answer as to why I am getting that error.

The thumbnail file...
Code: [Select]
<?php
set_time_limit(0);
require_once('classes/Create_Thumbnail.php');

$filter = '.jpg';
$directory = 'media'; // Do not include a trailing slash
$it = new RecursiveDirectoryIterator("$directory");
foreach(new RecursiveIteratorIterator($it) as $file) {
if (!((strpos(strtolower($file), $filter)) === false) || empty($filter)) {
$items[] = preg_replace("#\\\#", "/", $file);
}
}
foreach ($items as $item) {
$photo = new Create_Thumbnail($item);
$photo->createThumbnail();
}
?>

The Create_Thumbnail class...
Code: [Select]
<?php

class Create_Thumbnail
{
private $_photo;
private $_photoBasename;
private $_photoWidth;
private $_photoHeight;
private $_photoType;

private $_resizedPhoto;

private $_thumbFolder;
private $_thumbWidth  = 125;
private $_thumbHeight  = 125;
private $_thumbSuffix  = '_thumb';
private $_thumbnail;

/**
 * Constructor retrieves photo's basename, extension, width, and height.
 */
public function __construct($photo) 
{
$this->_photo  = $photo;
$this->_photoBasename  = pathinfo($this->_photo, PATHINFO_FILENAME);
$this->_extension  = pathinfo($this->_photo, PATHINFO_EXTENSION);
$this->_thumbFolder  = dirname($photo) . '/';
list($this->_photoWidth, $this->_photoHeight, $this->_photoType) = getimagesize($this->_photo);
}

/**
 * Method to resize the original image to a size that is much closer to the desired thumbnail size.
 */
public function resize() 
{
$photoRatio = $this->calculatePhotoRatio();
if ($photoRatio != 1) {
$this->_resizedWidth = round($this->_photoWidth * $photoRatio);
$this->_resizedHeight = round($this->_photoHeight * $photoRatio);
} else {
$this->_resizedWidth = $this->_thumbWidth;
$this->_resizedHeight = $this->_thumbHeight;
}
$resource = $this->createResource($this->_photoType, $this->_photo);
$resized = imagecreatetruecolor($this->_resizedWidth, $this->_resizedHeight);
imagecopyresampled($resized, $resource, 0, 0, 0, 0, $this->_resizedWidth, $this->_resizedHeight, $this->_photoWidth, $this->_photoHeight);
$this->_resizedPhoto = $this->_thumbFolder . $this->_photoBasename . '_resized.' . $this->_extension;
$this->createNewImage($this->_photoType, $resized, $this->_resizedPhoto);
imagedestroy($resource);
imagedestroy($resized);
return $this->_resizedPhoto;
}

/**
 * Method to create the thumbnail.
 */
public function createThumbnail() 
{
$source = $this->resize();
list($width_original, $height_original, $type) = getimagesize($source);
$base_name = pathinfo($source, PATHINFO_FILENAME);
$base_name = str_replace('_resized', '', $base_name);
$extension = pathinfo($source, PATHINFO_EXTENSION);
$source_x = ($width_original / 2) - ($this->_thumbWidth / 2);
$source_y = ($height_original / 2) - ($this->_thumbHeight / 2);
$resource = $this->createResource($type, $source);
$thumb = imagecreatetruecolor($this->_thumbWidth, $this->_thumbHeight);
imagecopyresampled($thumb, $resource, 0, 0, $source_x, $source_y, $this->_thumbWidth, $this->_thumbHeight, $this->_thumbWidth, $this->_thumbHeight);
$this->_thumbnail = $this->_thumbFolder . $base_name . $this->_thumbSuffix . '.' . $extension;
$this->createNewImage($type, $thumb, $this->_thumbnail);
unlink($source);
return $this->_thumbnail;
}

/**
 * Method to create an image resource.
 */
public function createResource($type, $source) 
{
switch ($type) {
case 1:
$resource = imagecreatefromgif($source);
break;
case 2:
$resource = imagecreatefromjpeg($source);
break;
case 3:
$resource = imagecreatefrompng($source);
break;
}
return $resource;
}

/**
 * Method to calculate the photo ratio.
 */
public function calculatePhotoRatio() 
{
if ($this->_photoWidth > $this->_photoHeight) {
$maximumHeight = $this->_thumbHeight;
$photoRatio = $maximumHeight / $this->_photoHeight;
} elseif ($this->_photoWidth < $this->_photoHeight) {
$maximumWidth = $this->_thumbWidth;
$photoRatio = $maximumWidth / $this->_photoWidth;
} else {
$photoRatio = 1;
}
return $photoRatio;
}

/**
 * Method to create a new image.
 */
public function createNewImage($type, $source, $destination) 
{
switch ($type) {
case 1:
if (function_exists('imagegif')) {
imagegif($source, $destination);
} else {
imagejpeg($source, $destination, 50);
}
break;
case 2:
imagejpeg($source, $destination, 100);
break;
case 3:
imagepng($source, $destination);
break;
}
}

}

The php.ini file...
Code: [Select]
file_uploads on
upload_max_filesize = 150M
post_max_size = 150M
max_input_time = -1
max_execution_time = 0
memory_limit = 150M
register_argc_argv = false

    Hi,

    I was curious if there is anyway to create website screenshots on the fly via a php script.

    Thanks,

    dilbertone - the first dilbert on earth

Hi everyone, would be grateful if anyone can help me. I recently changed my hosting package and didnt realize that the new package uses PHP 5. There is no option to use an earlier version but my thumbnail script that worked on PHP 4 just shows a red cross where the thumbnail should be. Can anyone tell me why the script below would not work with PHP 5. I have a basic understanding of how scripts work but I am not an expert so if you could make any replies easy to understand I have checked and the new server does have GD library version 2.0.34 installed - not sure if there is anything else I need to check ?
script called: uktn.php
Code: [Select]
<?
$maxwidth = 200;
$maxheight = 200;

$image_path = $_GET['im'];
$ext = explode('.', $image_path);
$i = count($ext)-1;

if ($ext[$i] == 'jpg' || $ext[$i] == 'jpeg' || $ext[$i] == 'JPG' || $ext[$i] == 'JPEG' ) {
    $img = @imagecreatefromjpeg($image_path);
} else if ($ext[$i] == 'png' || $ext[$i] == 'PNG') {
    $img = @imagecreatefrompng($image_path);
} else if ($ext[$i] == 'gif' || $ext[$i] == 'GIF') {
    $img = @imagecreatefromgif($image_path);
}

if ($img) {

    $width = imagesx($img);
    $height = imagesy($img);
    $scale = min($maxwidth/$width, $maxheight/$height);

    if ($scale < 1) {
        $new_width = floor($scale*$width);
        $new_height = floor($scale*$height);
        $tmp_img = imagecreatetruecolor($new_width, $new_height);
        imagecopyresized($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
        imagedestroy($img);
        $img = $tmp_img;
    }
}

if (!$img) {
exit ("You must specify an image!");
}

header("Content-type: image/png");
imagepng($img,'',100);
?>
Many thanks,
Dave

Goal: To have a gallery that downloads images from the folder I previously uploaded to in a previous script.

Bug: When I load the page the thumbnail comes up as broken and when I click on the thumbnail to get the bigger picture it comes up with the following error message:

"Firefox doesn't know how to open this address, because the protocol (c) isn't associated with any program."


<?php
include 'db.inc.php';
//connect to MySQL
$db = mysql_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD) or 
    die ('Unable to connect. Check your connection parameters.');
mysql_select_db(MYSQL_DB, $db) or die(mysql_error($db));

//change this path to match your images directory
$dir ='C:/x/xampp/htdocs/images';

//change this path to match your thumbnail directory
$thumbdir = $dir . '/thumbs';
?>
<html>
 <head>
  <title>Welcome to our Photo Gallery</title>
  <style type="text/css">
   th { background-color: #999;}
   .odd_row { background-color: #EEE; }
   .even_row { background-color: #FFF; }
  </style>
 </head>
 <body>
  <p>Click on any image to see it full sized.</p>
  <table style="width:100%;">
   <tr>
    <th>Image</th>
    <th>Caption</th>
    <th>Uploaded By</th>
    <th>Date Uploaded</th>
   </tr>
<?php
//get the thumbs
$result = mysql_query('SELECT * FROM images') or die(mysql_error());

$odd = true;
while ($rows = mysql_fetch_array($result)) {
    echo ($odd == true) ? '<tr class="odd_row">' : '<tr class="even_row">';
    $odd = !$odd; 
    extract($rows);
    echo '<td><a href="' . $dir . '/' . $image_id . '.jpg">';
    echo '<img src="' . $thumbdir . '/' . $image_id . '.jpg">';
    echo '</a></td>';
    echo '<td>' . $image_caption . '</td>';
    echo '<td>' . $image_username . '</td>';
    echo '<td>' . $image_date . '</td>';
    echo '</tr>';
}
?>
  </table>
 </body>
</html>


Any help appreciated.