February 2008
Intermediate to advanced
216 pages
4h 33m
English
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#67: Creating Thumbnail Images
When you allow users to upload images to your site (see "#54: Uploading Images to a Directory" on #54: Uploading Images to a Directory), you often need a small preview image (called a thumbnail) for inclusion on larger pages and image gallery browsing. This section shows you a function called mkthumb() that creates thumbnails with the help of GD. To use the function, you need the following:
A PHP-writable directory for writing the thumbnails (if you don't know how to make a directory writable, see "File Permissions" on File Permissions)
The GD library
The mkthumb() function takes two parameters: the name of the input image file and the desired name of the thumbnail. You need to independently verify that the image file ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.