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function wp_ajax_save_user_color_scheme() {
  global $_wp_admin_css_colors;

  check_ajax_referer( 'save-color-scheme', 'nonce' );

  $color_scheme = sanitize_key( $_POST['color_scheme'] );

  if ( ! isset( $_wp_admin_css_colors[ $color_scheme ] ) ) {
    wp_send_json_error();
  }

  $previous_color_scheme = get_user_meta( get_current_user_id(), 'admin_color', true );
  update_user_meta( get_current_user_id(), 'admin_color', $color_scheme );

  wp_send_json_success(
    array(
      'previousScheme' => 'admin-color-' . $previous_color_scheme,
      'currentScheme'  => 'admin-color-' . $color_scheme,
    )
  );
}