how can I unfold my php code in emacs?

Question

I'm a newbie in emacs 23.2.1. I want to edit my php files, and I got emacs' php mode from https://code.google.com/p/mewde/, but when I open php files and enter php-mode,this mode automatically folded some parts of my scripts,

<?php...
?>

I've tried every keys (got from the web, emacs-wiki,and C-h ? ,just like C-c C-c , C-c @ C-c .etc)but no one works, can anyone tell me the key to unfold my codes?

this is really a easy but bad but serious problem, I'll thank you and the god very much if you can show me a direction.

note:I'm using Ubuntu 11.04

[solved]:php-mode on https://code.google.com/p/mewde/ depends on c-mode,outline-mode,and hs-mode(hide-show-mode)to manage codes,so I use keys in outline-mode to hide and show the blocks.In my emacs,use "C-c @ C-a" to show all codes, and use "C-c @ C-t" to hide a body.thanks to Jay's remind !!

Answer 1

Have you tried

C-c C-o 
C-c C-f

Or just going straight to 'menu Commands->Unfold All Output'