こざくら日和 : Manual

CONFIGURE YOUR PHP

Setting MAX Upload Size

Defalut max value of "POST" in PHP4.3.x is 8MB and max of upload file size is 2MB. If you want to upload your stuff comfortably, I recommend to increase the size of these. To make this work, rewrite your "/usr/local/lib/php.ini" file on your server machine like:

Line 310

post_max_size = 8M

Line 378

upload_max_filesize = 2M

to

post_max_size = 100M
upload_max_filesize = 100M

and then reboot the server software.

If you are not allowed to modify php.ini, ask your system admin for more info.