En cuanto te pones a hacer páginas web, redirecciones o manejar un poco dominios, tienes que editar el fichero .htaccess, para poder modificar los parámetros de apache o php. Y no es fácil, porque tiene una sintaxis muy determinada y, como siempre en estos casos, o das con la clave o puedes liarla.
Os dejamos cómo redirigir a una url. En este caso para redirigir sin www a con www:
RewriteEngine On
rewriteCond %{HTTP_HOST} ^tudominio.com [NC]
rewriteRule ^(.*)$ http://www.tudominio.com/$1 [R=301,L]
Y aquí para redirigir el www a la de sin:
RewriteEngine on
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} ^www.(.+)$ [NC]
RewriteRule ^/(.*) http://%1/$1 [L,R=301]
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