I am displaying these alternate links in the header:
<link rel="alternate" hreflang="en" href="http://mysite/en/home/"/>
<link rel="alternate" hreflang="fr" href="http://mysite/fr/home/"/>
<link rel="alternate" hreflang="en" href="http://mysite/home/"/>
The default lang is English, but for those who have a browser in French it will display the site in French according to $browserLang = substr(@$_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
Is it a problem for the SEO having 2 links with the same hreflang?