Restrict Specific Users

This shortcode below can be used to restrict content from specific users by providing their user id.

// Add Shortcode
function restrict_user( $atts , $content = null ) {
    // Attributes
    $atts = shortcode_atts(
        array(
            'user_id' => '',
        ),
        $atts
    );
    $current_user = get_current_user_id();
    $restricted_ids=explode(",",$atts['user_id']);
    if(in_array($current_user,$restricted_ids)){
        $content = "";
    }
    return "<p>".$content."</p>";
}
add_shortcode( 'restrict_users', 'restrict_user' );

Example usage [restrict_users user_id=”32,4″]My Content to Restrict[/restrict_users]