Dynamically Resizing Images "on the fly"

[Arty Ziff]

I use something like this to resize dynamically images. Is there a way to wrap this in a function and class that when called returns the image object?

<? 
$src_img = imagecreatefromjpeg('./path/to/image.jpg'); 
$srcsize = getimagesize('./path/to/image.jpg'); 
$dest_x = 200; 
$dest_y = (200 / $srcsize[0]) * $srcsize[1]; 
$dst_img = imagecreatetruecolor($dest_x, $dest_y); 
imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dest_x, $dest_y, $srcsize[0], $srcsize[1]); 
header("content-type: image/jpeg"); 
imagejpeg($dst_img); 
imagedestroy($src_img); 
imagedestroy($dst_img); 
?> 

For exacmple, right now I could use it to dynamically resize images by having it inline in the HTML:

<img src="./image_script.php?img=image_name.jpg">

But if it could be wrapped in a class / function, it could be done without exposing the script to possible exploitation maybe...

 

I'd like to avoid resizing the image and dumping it in a temp directory. That could get huge.

[ignace]

take a look at:

http://mediumexposure.com/techblog/smart-image-resizing-while-preserving-transparency-php-and-gd-library

 

also make sure your memory_limit is high enough to resize big images

[nashruddin]

Here's my class to create image's thumbnail on-the-fly:

 

http://www.nashruddin.com/create-image-thumbnail-on-the-fly.html