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Image gallery in 5 minutes using ColdFusion and PHP

Ok, here's the scoop:  I needed a way to show thumbnails for some photos and I didn't want to spend any more than 15 minutes to do it.  Talk about deadline, huh?  Anyway, here is what I came up with, and yep, I managed to throw it together in [about] 15 minutes.  You get to copy my code and implement it in 5 minutes, hence the subject.

Overview:  This is running on a LINUX server running apache, with a modern PHP and ColdFusion 6.1.  Your server may not have the same specs, so this code won't work.  If so, sorry it didn't work out.

This solution is to create a directory with images in it (jpegs for example).  To make it a gallery, we throw in an index.cfm page that uses <cfdirectory> to get a list of images to display.  We then loop through the listing, and for each image, generate a link and thumbnail using a nifty php script.  The php script creates a thumbnail on the fly and stores it in a subdir, and then displays it.  Cool, huh? 

WARNING: This solution is not pretty-looking.  Thats something you can do with your precious "more than 15 minutes" allocated time slot.

Alright, here's the code:

index.cfm:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

        <title>Image Index</title>

</head>

<body style="font-family:sans-serif; font-size:9pt;">

<cfdirectory name="proof_files" action="LIST" directory="#ExpandPath(".")#">

<cfset cols="3">

<strong>Files by name:</strong><br>

<table>

<tr>

    <cfset idx = -1>

    <cfloop query="proof_files">

    <cfif (Name contains ".jpg")>

        <cfset idx = idx + 1>

        <cfif (idx mod cols) IS 0></tr><tr></cfif>

        <cfoutput>

        <td>

        <a href="#proof_files.name#">

        <img src="resize.php?main_file=#proof_files.name#"><br>

        #proof_files.name#</a></td>

        </cfoutput>

    </cfif>

    </cfloop>

</tr>

</table>

</body>

</html>


resize.php:

<?php

$image = "./" . $_GET['main_file'];

$savelocation = "./thumbs/";

if(!file_exists("$savelocation"))

{

  $oldumask = umask(0);

  mkdir("$savelocation", 0777);

  umask($oldumask);

}

if (file_exists($savelocation . "thumb_" . $_GET['main_file']))

{

  header('Location: thumbs/thumb_' . $_GET['main_file'] );

  exit();

}

if (!$max_width)

  $max_width = 125;

if (!$max_height)

  $max_height = 125;

$size = GetImageSize($image);

$width = $size[0];

$height = $size[1];

$x_ratio = $max_width / $width;

$y_ratio = $max_height / $height;

if ( ($width <= $max_width) && ($height <= $max_height) ) {

  $tn_width = $width;

  $tn_height = $height;

}

else if (($x_ratio * $height) < $max_height) {

  $tn_height = ceil($x_ratio * $height);

  $tn_width = $max_width;

}

else {

  $tn_width = ceil($y_ratio * $width);

  $tn_height = $max_height;

}

$src = ImageCreateFromJpeg($image);

$dst = ImageCreate($tn_width,$tn_height);

ImageCopyResized($dst, $src, 0, 0, 0, 0,

    $tn_width,$tn_height,$width,$height);

ImageJpeg($dst,"$savelocation"."thumb_" . $_GET['main_file'] );

ImageDestroy($src);

ImageDestroy($dst);

header('Location: thumbs/thumb_' . $_GET['main_file'] );

?>

Directions:


    1. Make a directory on your web server

    2. Upload some jpg's in the new folder

    3. Copy index.cfm and resize.php into the same directory

    4. Open a web browser and check it out

Gotchas:

The first time I ran the php script, it choked on memory because PHP has a maximum amount of memory that a script request can use.  I had to increase this limit for it to load larger images.  The setting was in /etc/php.ini and looked like so:

memory_limit = 32M      ; Maximum amount of memory a script may consume (default = 8MB)

Also, the color palletes of the thumbnails leave a little to be desired.  Oh well, at least it worked and we didnt waste too much time.

This script can bog down the server if you are generating a lot of thumbnails at once,  however the resize.php script does check to see if a thumbnail has been generated before, and if so, does not generate another one, so the overhead you experience should only be the first time a thumbnail is generated for a new image.

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