If you qualify you will be issued a tourist visa upon entry into the Philippines which is valid for 21 days. Coming from Australia and being an Australian citizen you will automatically qualify.
This can be extended for an additional 38 days upon application to the immigration department to a total of 59 days.
There is a fee of around 3500php payable for the extension.
To see if you qualify for a Philippine Visa please check the Philippine Bureau of Immigration website: http://www.immigration.gov.ph/
