First, the setting you want is 'upload_max_filesize'
, not 'upload_max_size'
. Second, both of those settings are PHP_INI_PERDIR
, which means they can only be set with php.ini, .htaccess, or httpd.conf. For more information see the PHP documentation on php.ini directives and their configuration.
I would suggest using .htaccess, personally. You might look into writing the information directly to the file from the script, just like WordPress attempts to do for rewrite rules.
EDIT
I just realized that I told you to do it in .htaccess but didn’t tell you how. To set those values in .htaccess add the following lines to the file (anywhere in the file):
php_value upload_max_filesize 100M
php_value post_max_size 105M