- php version?
PHP version >= 5.2.1
- cache directory?
web server has write access
- image thumbs?
PHP GD extension with JPEG support available
- movie thumbs?
command 'ffmpeg' available
- pdf thumbs?
command 'convert' available
- shell tar?
command 'tar' available
- shell zip?
command 'zip' available
- folder size?
command 'du' available