how do i pass post values from my site to another website(URL) with PHP?
Why would you want to do this?
You could use:
www.domain.com/index.php?var1=$val1
to pass val1 to var1 at page index.php. Is that what you were after?
<form action="http://www.anothersite.com/page.ext" method="post"> <!--code--> </form>
And if you're talking about POST'ing info via a PHP script, you'd probably want to use something like [man]cURL[/man].