How to create and store a thumbnail in php
Here I will show you guys how to create a thumbnail from a larger image file ( .jpg file)
You create a new .php file, and enter this function:
1 2 3 4 5 6 7 8 9 10 11 | <?php function thumbnail($file, $size, $save_as) { list($width, $height) = getimagesize($file) ; $modwidth = $width * $size; $modheight = $height * $size; $tn = imagecreatetruecolor($modwidth, $modheight) ; $image = imagecreatefromjpeg($file) ; imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ; imagejpeg($tn, $save_as, 100) ; } ?> |
then you can call the function like this:
1 2 3 | <?php thumbnail('original_image.jpg', '0.60', 'new_image.jpg'); ?> |
The last part calls the function, and tells it to create a thumbnail from the “original_image.jpg”, with 0.6 the size of the original, and store the new image as “new_image.jpg” in the same folder as the script.
Some of the code in the function is explained in this post.
Simple 
Thursday, July 19th, 2007 at 10:55 am
Creating thumbnails in PHP with GD works fine for small images, but the memory limit is often to short when we are talking about larger. Thats may be a problem, so its best to be aware of it. A solution is to use server-side (PHP) for small images, and client-side (Javascript (Ajax), Java ..) for the smaller ones.
Einar
Thursday, July 19th, 2007 at 10:59 am
Uhh… I meant:
A solution is to use server-side (PHP) for small images, and client-side (Javascript (Ajax), Java ..) for the larger ones.
Thursday, July 19th, 2007 at 1:03 pm
Yes I know
I should probably write a guide on how to do it in ajax too 
But for small avatars in forums and such, this works fine 
Ratman87