> How i can automatically generate route with google maps in php?

Have you looked at the documentation?
http://code.google.com/apis/maps/documentation/javascript/services.html#Directions
http://code.google.com/apis/maps/documentation/javascript/v2/services.html#Directions
http://code.google.com/apis/maps/documentation/directions/

> I need know
> how many km.

You might be interested in
http://code.google.com/apis/maps/documentation/distancematrix/

Beware the terms of use
http://code.google.com/apis/maps/terms.html
10.1.1(g)
"You must not use or display the Content without a corresponding
Google map ..."

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