Create a filter for adding sites via themes and other plugins

Great plugin, being able to call it from themes or other plugins would be really useful.

You can add a filter just before you print the HTML, in dns-prefetch.php line 126.

Before:

$tta = explode("\n", $options[DPF_DEFAULT_TEXT_NAME]);

After:

$tta = explode("\n", $options[DPF_DEFAULT_TEXT_NAME]);
$tta = apply_filters('dpf_domains', $tta);

Now we can add our own prefetch domains via:

add_filter('dpf_domains', function($tta)
{
    $tta[] = '//another-domain.com';
    return $tta;
});

Cheers!

https://www.ads-software.com/plugins/dns-prefetch/