As a general rule, you can use your overseas driving license in Australia for up to 3 months.. after that you need to apply a permanent one..
Unfortunately, a Ph driver's license cannot be converted
Here is the information from the department of transport (WA).. I would assume the same rule applies to other states:
If you hold a driver's licence from a ‘recognised country’ and the licence has not expired by more than 12 months, when applying for a WA licence:
<b>Recognised countries: </b>
Austria Guernsey New Zealand
Belgium Ireland Norway
Canada Isle of Man* Portugal
Croatia Italy Singapore
Denmark Japan Spain
Finland Jersey Sweden
France Luxembourg Switzerland
Germany Malta ** United Kingdom
Greece Netherlands United States of America