dark-theme.php

<?php

    // Sektion erstellen für das dunkle Theme
	$wp_customize->add_section("darktheme", array(
		"title" => __("Dunkles Theme", "customizer_dark_sections"),
		"priority" => 40,
	));
  // Die Einstellungen definieren  
$wp_customize->add_setting('darktheme_css', array(
    'capability' => 'edit_theme_options',
    "transport" => "refresh",
));
 
// Die Eingabemöglichkeit erstellen
	$wp_customize->add_control(new WP_Customize_Control(
		$wp_customize,
		"dark_theme_css",
		array(
			"label" => __("Das dunkle Theme aktivieren", "customizer_dark_theme_label"),
			"section" => "darktheme",
			"settings" => "darktheme_css",
			"type" => "checkbox",
		)
));