Redirect using .htaccess from a PHP page to another both with variables -

Redirect using .htaccess from a PHP page to another both with variables -

i have simple question, cant find way it. need redirect or rewrite this:

http://mydomain.com/libro.php?isbn=9788493652470

to this:

http://mydomain.com/busqueda.php?busqueda=medimecum

i have tried doesn’t work:

redirect 301 /libro.php?isbn=9788493652470 http://mydomain.com/busqueda.php?busqueda=medimecum

a straight redirect not work well. using mod_rewrite rewritecond query string work well. should work example:

rewriteengine on rewritecond %{query_string} isbn=9788493652470 rewriterule ^libro.php http://mydomain.com/busqueda.php?busqueda=medimecum [l,r=301]

now looking @ question 1 time again it’s not clear if want pass along original query string, correct? url:

http://mydomain.com/libro.php?isbn=9788493652470

would become url:

http://mydomain.com/busqueda.php?busqueda=medimecum&isbn=9788493652470

but if somehow wanted that, add together qsa (query string append) flag rewriterule this:

rewriteengine on rewritecond %{query_string} isbn=9788493652470 rewriterule ^libro\.php http://mydomain.com/busqueda.php?busqueda=medimecum [l,r=301,qsa]

php .htaccess redirect