if you want to do it in site run by wordpress then install insert_php
plugin
http://ww.wp.xz.cn/plugins/insert-php/
and use this syntax.
[insert_php] instead of <?php
and
[/insert_php] instead of ?>
like this:
[insert_php]
//your code here
[/insert_php]
and that to in the text part of the page/post editor, not in the visual editor.
