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<?php

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/**

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* Customize API: WP_Customize_Header_Image_Setting class

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* @package WordPress

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* @subpackage Customize

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* @since 4.4.0

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/**

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* A setting that is used to filter a value, but will not save the results.

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* Results should be properly handled using another setting or callback.

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* @since 3.4.0

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* @see WP_Customize_Setting

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final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {

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/**

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* Unique string identifier for the setting.

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* @since 3.4.0

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* @var string

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public $id = 'header_image_data';

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/**

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* @since 3.4.0

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* @global Custom_Image_Header $custom_image_header

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* @param mixed $value The value to update.

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public function update( $value ) {

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global $custom_image_header;

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// If _custom_header_background_just_in_time() fails to initialize $custom_image_header when not is_admin().

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if ( empty( $custom_image_header ) ) {

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require_once ABSPATH . 'wp-admin/includes/class-custom-image-header.php';

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$args = get_theme_support( 'custom-header' );

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$admin_head_callback = isset( $args[0]['admin-head-callback'] ) ? $args[0]['admin-head-callback'] : null;

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$admin_preview_callback = isset( $args[0]['admin-preview-callback'] ) ? $args[0]['admin-preview-callback'] : null;

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$custom_image_header = new Custom_Image_Header( $admin_head_callback, $admin_preview_callback );

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}

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* If the value doesn't exist (removed or random),

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* use the header_image value.

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if ( ! $value ) {

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$value = $this->manager->get_setting( 'header_image' )->post_value();

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}

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if ( is_array( $value ) && isset( $value['choice'] ) ) {

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$custom_image_header->set_header_image( $value['choice'] );

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} else {

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$custom_image_header->set_header_image( $value );

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}

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}

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}

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