Drupal 6: Programmatically generate all images for each imagecache preset using a Drush PHP script
My Drupal photo gallery implements a total of 9 imagecache presets, but due to a PHP memory_limit cap of 90MB in my previous hosting contract, I frequently encountered issues generating images.
Since I was on a shared hosting plan, PHP was executed as CGI and a service ran on the server to kill PHP scripts that reached the PHP memory_limit. This resulted in the following error, which prevented imagecache from creating missing images and redirecting the user properly.
After changing my hosting plan and increasing my server resources, I decided to write a PHP script to programmatically generate all the missing images. This script when executed on the shell using Drush, will get a list of every image in the files directory, and make an HTTP request for each imagecache preset URL.
I executed this script on the shell using the following drush command:
The script logs every request and can be reviewed afterward: