Use PHP with WordPress

Hi.

(I’m french and I speack not very good english, sorry.)

I will to use PHP with my WordPress but I can’t.

I have understand I can’t use PHP direct in my Page.

I see a plugin: http://plugins.trac.ww.wp.xz.cn/wiki/RunPHP

But the link for DL is broken.

Have you a plugin for use PHP direct in my Page WordPress please ?

Thanks.