easy question to forward an URL

hi, maybe it's just a easy question
I am building a site which are contain 3 directory under public_html, those directory are portal, gallery and forum. currently to forward site automatically to mydomain.com/portal/
i'm using :

<META http-equiv="refresh" content="0;URL=w w w.mydomain.com/portal/" >

in index.html under public_html (root)
is there any better way to do it, maybe using php or else, since I found there is a litlle time lag to forward it ..

thanks

 

 

 

 

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