Gets the colors in the current WordPress admin color scheme

get-wp-colors.php

function build_admin_colors() {
    global $_wp_admin_css_colors;
    $current_color_scheme = get_user_meta(get_current_user_id(), 'admin_color', true);
    $colors = array_merge(
        $_wp_admin_css_colors[$current_color_scheme]->colors,
        $_wp_admin_css_colors[$current_color_scheme]->icon_colors
    );
    return $colors;
}