WordPress/wp-includes/customize/class-wp-customize-header-image-setting.php

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<?php
/**
* WordPress Customize Setting classes
*
* @package WordPress
* @subpackage Customize
* @since 4.4.0
*/
/**
* A setting that is used to filter a value, but will not save the results.
*
* Results should be properly handled using another setting or callback.
*
* @since 3.4.0
*
* @see WP_Customize_Setting
*/
final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
public $id = 'header_image_data';
/**
* @since 3.4.0
*
* @global Custom_Image_Header $custom_image_header
*
* @param $value
*/
public function update( $value ) {
global $custom_image_header;
// If the value doesn't exist (removed or random),
// use the header_image value.
if ( ! $value )
$value = $this->manager->get_setting('header_image')->post_value();
if ( is_array( $value ) && isset( $value['choice'] ) )
$custom_image_header->set_header_image( $value['choice'] );
else
$custom_image_header->set_header_image( $value );
}
}