Slider autoplay

gistfile1.php

<?php 
	// Slider autoplay toggle.
	$wp_customize->add_setting( 'slider_autoplay', array(
		'default'           => 'disabled',
		'sanitize_callback' => 'twentyfourteen_sanitize_slider_autoplay',
	) );

	$wp_customize->add_control( 'slider_autoplay', array(
		'label'   => __( 'Slider Autoplay', 'twentyfourteen' ),
		'section' => 'featured_content',
		'type'    => 'select',
		'choices' => array(
			'disabled'   => __( 'Disabled',   'twentyfourteen' ),
			'enabled' => __( 'Enabled', 'twentyfourteen' ),
		),
		'priority' 	=> 2,
	) );
	
	
	
/**
 * Sanitize the Slider Autoplay value.
 *
 * @since Twenty Fourteen 1.0
 *
 * @param string $layout Layout type.
 * @return string Filtered autoplay value (disabled|enabled).
 */ 
function twentyfourteen_sanitize_slider_autoplay( $autoplay ) {
	if ( ! in_array( $autoplay, array( 'disabled', 'enabled' ) ) ) {
		$autoplay = 'disabled';
	}

	return $autoplay;
}