How to resize thousands of images with PHP script

[JayCally]

So I'm new to ImageMagick and need to resize thousands of photos on a Wordpress site. Contributors have been posting 5000x5000px images for the past 2 years on this site and we ran out of room. There are way to many images for any WordPress plugin to process and I read that ImageMagick can help.

We can't use command line with our host and they suggested to run a PHP script as they already have ImageMagick installed. I've searched and can't find a good example.

I need to search through the WordPress image folder for all files (lets say) bigger than 1024x1024 and resize them to 1024x1024.

Does anyone have a PHP script that they could share?

Thanks.

[Bonzo]

The method I would use is use glob() to select all the images starting with for example "a" and the use a foreach loop to modify those then move onto 'b" etc. The reason for this is php will time out after a while.
Alternately you could get all the image names into one array and work on a known number at a time to prevent php timing out.

Also alter your upload code ASAP to resize the images on upload to stop this from happening again!

[JayCally]

Thanks @Bonzo

I've installed Imsanity on that site to size all those large files down when uploaded through WordPress.

I just gotta come up with a PHP script to size down all those old files.

[fmw42]

To resize a folder of images, use mogrify. See http://www.imagemagick.org/Usage/basics/#mogrify. Save to a new directory so you do not overwrite your originals using the -path option

Are all your images the same format? If not, do you want to change to a common format such as JPG or PNG

Suppose your images are in directory test1 and no other non-image files are there. First create a new directory test2. Then in PHP exec(), put the command

Code: Select all

mogrify -path path2/test2 -format JPG -resize 1024x1024\> *

where path2 is the full path to folder test2.

That will resize any image larger than 1024x1024 into the same name with .JPG as suffix and put it into test2.