只需检查当前主机：

add_filter( \'the_content\', \'domain_dependent_content\' );

function domain_dependent_content( $content )
{
    // get_the_ID() will return the current post ID if you need 
    // more information about the current page.

    if ( \'page\' !== get_post_type() )
        return $content;

    if ( \'au.example.com\' === $_SERVER[\'HTTP_HOST\'] )
        return "G\'Day buddy!<br>$content";

    if ( \'uk.example.com\' === $_SERVER[\'HTTP_HOST\'] )
        return "How do you do?<br>$content";

    if ( \'us.example.com\' === $_SERVER[\'HTTP_HOST\'] )
        return "Hi!<br>$content";

    return $content;
}