You are using get_option() wrong, first variant, so take another look at the get_option() documentation. Basically you can't directly access an array element with the function, it just doesn't support it.

The second variant should be possible, but you need at least PHP 5.4 - if I'm not totally mistaken; I don't know anything about dreamweaver.

The reason why you can't access the variable everywhere you want is the variable scope, read up on it at the PHP Manual: Variable scope.

The easiest thing I imagine is to do it the old fashion way, just make a function you can use. Exemplary like this:

function wpse_179693_echo_my_options_array_value() {
    $social_options = get_option( 'sultenhest_theme_social_options' );
    if ( isset( $social_options['twitter'] ) ) {
        echo $social_options['twitter'];
    } else {
        return FALSE;
    }
}


get_option function
I want to understand how focusing works in Manual mode in my D90.  I  switched off the autofocus buttons in the Kit lens and the camera body. I have changed to the manual mode. Now, when I try to focus on any specific object, I do not see any specific focus point being highlighted when I press the shutter button halfway. All the focus points on the view finders lights up in red and camera clicks immediately after pressing the shutter button fully. 

I want to know why I am not able to focus on any specific object. For example, if I want to focus on the nearer object, so that the background is little blurred, then I dont seem to be able to do this. (I want to achive the 'Bokeh' effect)
