WP_Customize_Header_Image_Setting::update( mixed $value )

Source

public function update( $value ) {
	global $custom_image_header;
	// If _custom_header_background_just_in_time() fails to initialize $custom_image_header when not is_admin().
	if ( empty( $custom_image_header ) ) {
		require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';
		$args                   = get_theme_support( 'custom-header' );
		$admin_head_callback    = isset( $args[0]['admin-head-callback'] ) ? $args[0]['admin-head-callback'] : null;
		$admin_preview_callback = isset( $args[0]['admin-preview-callback'] ) ? $args[0]['admin-preview-callback'] : null;
		$custom_image_header    = new Custom_Image_Header( $admin_head_callback, $admin_preview_callback );
	}
	/*
	 * 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 );
	}
}

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