FM / includes

/home/altere25/rmllproject.altereddigital.com/wp-admin/includes/

/home/altere25/rmllproject.altereddigital.com/wp-admin/includes

Name	Size	Mode	Actions
admin-filters.php	8034	0644	edit dl rm
admin.php	3628	0644	edit dl rm
ajax-actions.php	153540	0644	edit dl rm
bookmark.php	11678	0644	edit dl rm
class-automatic-upgrader-skin.php	3663	0644	edit dl rm
class-bulk-plugin-upgrader-skin.php	2590	0644	edit dl rm
class-bulk-theme-upgrader-skin.php	2660	0644	edit dl rm
class-bulk-upgrader-skin.php	6661	0644	edit dl rm
class-core-upgrader.php	15198	0644	edit dl rm
class-custom-background.php	21750	0644	edit dl rm
class-custom-image-header.php	49249	0644	edit dl rm
class-file-upload-upgrader.php	4163	0644	edit dl rm
class-ftp-pure.php	5426	0644	edit dl rm
class-ftp-sockets.php	8479	0644	edit dl rm
class-ftp.php	27342	0644	edit dl rm
class-language-pack-upgrader-skin.php	2870	0644	edit dl rm
class-language-pack-upgrader.php	15528	0644	edit dl rm
class-pclzip.php	196667	0644	edit dl rm
class-plugin-installer-skin.php	11947	0644	edit dl rm
class-plugin-upgrader-skin.php	3278	0644	edit dl rm
class-plugin-upgrader.php	23249	0644	edit dl rm
class-theme-installer-skin.php	12974	0644	edit dl rm
class-theme-upgrader-skin.php	4176	0644	edit dl rm
class-theme-upgrader.php	26783	0644	edit dl rm
class-walker-category-checklist.php	5092	0644	edit dl rm
class-walker-nav-menu-checklist.php	5781	0644	edit dl rm
class-walker-nav-menu-edit.php	14298	0644	edit dl rm
class-wp-ajax-upgrader-skin.php	4193	0644	edit dl rm
class-wp-application-passwords-list-table.php	6949	0644	edit dl rm
class-wp-automatic-updater.php	61905	0644	edit dl rm
class-wp-comments-list-table.php	34620	0644	edit dl rm
class-wp-community-events.php	18647	0644	edit dl rm
class-wp-debug-data.php	71043	0644	edit dl rm
class-wp-filesystem-base.php	25622	0644	edit dl rm
class-wp-filesystem-direct.php	19166	0644	edit dl rm
class-wp-filesystem-ftpext.php	24926	0644	edit dl rm
class-wp-filesystem-ftpsockets.php	20356	0644	edit dl rm
class-wp-filesystem-ssh2.php	25815	0644	edit dl rm
class-wp-importer.php	8279	0644	edit dl rm
class-wp-internal-pointers.php	4593	0644	edit dl rm
class-wp-links-list-table.php	10103	0644	edit dl rm
class-wp-list-table-compat.php	1497	0644	edit dl rm
class-wp-list-table.php	54873	0644	edit dl rm
class-wp-media-list-table.php	27786	0644	edit dl rm
class-wp-ms-sites-list-table.php	23598	0644	edit dl rm
class-wp-ms-themes-list-table.php	30266	0644	edit dl rm
class-wp-ms-users-list-table.php	16188	0644	edit dl rm
class-wp-plugin-install-list-table.php	25076	0644	edit dl rm
class-wp-plugins-list-table.php	61549	0644	edit dl rm
class-wp-post-comments-list-table.php	1453	0644	edit dl rm
class-wp-posts-list-table.php	68457	0644	edit dl rm
class-wp-privacy-data-export-requests-list-table.php	6026	0644	edit dl rm
class-wp-privacy-data-removal-requests-list-table.php	6178	0644	edit dl rm
class-wp-privacy-policy-content.php	33021	0644	edit dl rm
class-wp-privacy-requests-table.php	14806	0644	edit dl rm
class-wp-screen.php	37566	0644	edit dl rm
class-wp-site-health-auto-updates.php	14337	0644	edit dl rm
class-wp-site-health.php	131168	0644	edit dl rm
class-wp-site-icon.php	6489	0644	edit dl rm
class-wp-terms-list-table.php	21584	0644	edit dl rm
class-wp-theme-install-list-table.php	15703	0644	edit dl rm
class-wp-themes-list-table.php	10339	0644	edit dl rm
class-wp-upgrader-skin.php	7064	0644	edit dl rm
class-wp-upgrader-skins.php	1477	0644	edit dl rm
class-wp-upgrader.php	48367	0644	edit dl rm
class-wp-users-list-table.php	19351	0644	edit dl rm
comment.php	9457	0644	edit dl rm
continents-cities.php	20540	0644	edit dl rm
credits.php	5832	0644	edit dl rm
dashboard.php	70616	0644	edit dl rm
deprecated.php	41960	0644	edit dl rm
edit-tag-messages.php	1478	0644	edit dl rm
export.php	25976	0644	edit dl rm
file.php	98424	0644	edit dl rm
image-edit.php	44147	0644	edit dl rm
image.php	45172	0644	edit dl rm
import.php	6617	0644	edit dl rm
list-table.php	3802	0644	edit dl rm
media.php	120188	0644	edit dl rm
menu.php	9640	0644	edit dl rm
meta-boxes.php	66857	0644	edit dl rm
misc.php	46443	0644	edit dl rm
ms-admin-filters.php	1296	0644	edit dl rm
ms-deprecated.php	3770	0644	edit dl rm
ms.php	35959	0644	edit dl rm
nav-menu.php	49136	0644	edit dl rm
network.php	27038	0644	edit dl rm
noop.php	1148	0644	edit dl rm
options.php	4303	0644	edit dl rm
plugin-install.php	39187	0644	edit dl rm
plugin.php	93295	0644	edit dl rm
post.php	82229	0644	edit dl rm
privacy-tools.php	33732	0644	edit dl rm
revision.php	16629	0644	edit dl rm
schema.php	45583	0644	edit dl rm
screen.php	6390	0644	edit dl rm
taxonomy.php	8483	0644	edit dl rm
template.php	99830	0644	edit dl rm
theme-install.php	7010	0644	edit dl rm
theme.php	47533	0644	edit dl rm
translation-install.php	11048	0644	edit dl rm
update-core.php	86142	0644	edit dl rm
update.php	34829	0644	edit dl rm
upgrade.php	116674	0644	edit dl rm
user.php	23913	0644	edit dl rm
widgets.php	10546	0644	edit dl rm

Edit: /home/altere25/rmllproject.altereddigital.com/wp-admin/includes/class-custom-background.php (21750B)

<?php
/**
 * The custom background script.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * The custom background class.
 *
 * @since 3.0.0
 */
#[AllowDynamicProperties]
class Custom_Background {

/**
	 * Callback for administration header.
	 *
	 * @since 3.0.0
	 * @var callable
	 */
	public $admin_header_callback;

/**
	 * Callback for header div.
	 *
	 * @since 3.0.0
	 * @var callable
	 */
	public $admin_image_div_callback;

/**
	 * Used to trigger a success message when settings updated and set to true.
	 *
	 * @since 3.0.0
	 * @var bool
	 */
	private $updated;

/**
	 * Constructor - Registers administration header callback.
	 *
	 * @since 3.0.0
	 *
	 * @param callable $admin_header_callback    Optional. Administration header callback.
	 *                                           Default empty string.
	 * @param callable $admin_image_div_callback Optional. Custom image div output callback.
	 *                                           Default empty string.
	 */
	public function __construct( $admin_header_callback = '', $admin_image_div_callback = '' ) {
		$this->admin_header_callback    = $admin_header_callback;
		$this->admin_image_div_callback = $admin_image_div_callback;

add_action( 'admin_menu', array( $this, 'init' ) );

add_action( 'wp_ajax_custom-background-add', array( $this, 'ajax_background_add' ) );

// Unused since 3.5.0.
		add_action( 'wp_ajax_set-background-image', array( $this, 'wp_set_background_image' ) );
	}

/**
	 * Sets up the hooks for the Custom Background admin page.
	 *
	 * @since 3.0.0
	 */
	public function init() {
		$page = add_theme_page(
			_x( 'Background', 'custom background' ),
			_x( 'Background', 'custom background' ),
			'edit_theme_options',
			'custom-background',
			array( $this, 'admin_page' )
		);

if ( ! $page ) {
			return;
		}

add_action( "load-{$page}", array( $this, 'admin_load' ) );
		add_action( "load-{$page}", array( $this, 'take_action' ), 49 );
		add_action( "load-{$page}", array( $this, 'handle_upload' ), 49 );

if ( $this->admin_header_callback ) {
			add_action( "admin_head-{$page}", $this->admin_header_callback, 51 );
		}
	}

/**
	 * Sets up the enqueue for the CSS & JavaScript files.
	 *
	 * @since 3.0.0
	 */
	public function admin_load() {
		get_current_screen()->add_help_tab(
			array(
				'id'      => 'overview',
				'title'   => __( 'Overview' ),
				'content' =>
					'<p>' . __( 'You can customize the look of your site without touching any of your theme&#8217;s code by using a custom background. Your background can be an image or a color.' ) . '</p>' .
					'<p>' . __( 'To use a background image, simply upload it or choose an image that has already been uploaded to your Media Library by clicking the &#8220;Choose Image&#8221; button. You can display a single instance of your image, or tile it to fill the screen. You can have your background fixed in place, so your site content moves on top of it, or you can have it scroll with your site.' ) . '</p>' .
					'<p>' . __( 'You can also choose a background color by clicking the Select Color button and either typing in a legitimate HTML hex value, e.g. &#8220;#ff0000&#8221; for red, or by choosing a color using the color picker.' ) . '</p>' .
					'<p>' . __( 'Do not forget to click on the Save Changes button when you are finished.' ) . '</p>',
			)
		);

get_current_screen()->set_help_sidebar(
			'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
			'<p>' . __( '<a href="https://codex.wordpress.org/Appearance_Background_Screen">Documentation on Custom Background</a>' ) . '</p>' .
			'<p>' . __( '<a href="https://wordpress.org/support/forums/">Support forums</a>' ) . '</p>'
		);

wp_enqueue_media();
		wp_enqueue_script( 'custom-background' );
		wp_enqueue_style( 'wp-color-picker' );
	}

/**
	 * Executes custom background modification.
	 *
	 * @since 3.0.0
	 */
	public function take_action() {
		if ( empty( $_POST ) ) {
			return;
		}

if ( isset( $_POST['reset-background'] ) ) {
			check_admin_referer( 'custom-background-reset', '_wpnonce-custom-background-reset' );

remove_theme_mod( 'background_image' );
			remove_theme_mod( 'background_image_thumb' );

$this->updated = true;
			return;
		}

if ( isset( $_POST['remove-background'] ) ) {
			// @todo Uploaded files are not removed here.
			check_admin_referer( 'custom-background-remove', '_wpnonce-custom-background-remove' );

set_theme_mod( 'background_image', '' );
			set_theme_mod( 'background_image_thumb', '' );

$this->updated = true;
			wp_safe_redirect( $_POST['_wp_http_referer'] );
			return;
		}

if ( isset( $_POST['background-preset'] ) ) {
			check_admin_referer( 'custom-background' );

if ( in_array( $_POST['background-preset'], array( 'default', 'fill', 'fit', 'repeat', 'custom' ), true ) ) {
				$preset = $_POST['background-preset'];
			} else {
				$preset = 'default';
			}

set_theme_mod( 'background_preset', $preset );
		}

if ( isset( $_POST['background-position'] ) ) {
			check_admin_referer( 'custom-background' );

$position = explode( ' ', $_POST['background-position'] );

if ( in_array( $position[0], array( 'left', 'center', 'right' ), true ) ) {
				$position_x = $position[0];
			} else {
				$position_x = 'left';
			}

if ( in_array( $position[1], array( 'top', 'center', 'bottom' ), true ) ) {
				$position_y = $position[1];
			} else {
				$position_y = 'top';
			}

set_theme_mod( 'background_position_x', $position_x );
			set_theme_mod( 'background_position_y', $position_y );
		}

if ( isset( $_POST['background-size'] ) ) {
			check_admin_referer( 'custom-background' );

if ( in_array( $_POST['background-size'], array( 'auto', 'contain', 'cover' ), true ) ) {
				$size = $_POST['background-size'];
			} else {
				$size = 'auto';
			}

set_theme_mod( 'background_size', $size );
		}

if ( isset( $_POST['background-repeat'] ) ) {
			check_admin_referer( 'custom-background' );

$repeat = $_POST['background-repeat'];

if ( 'no-repeat' !== $repeat ) {
				$repeat = 'repeat';
			}

set_theme_mod( 'background_repeat', $repeat );
		}

if ( isset( $_POST['background-attachment'] ) ) {
			check_admin_referer( 'custom-background' );

$attachment = $_POST['background-attachment'];

if ( 'fixed' !== $attachment ) {
				$attachment = 'scroll';
			}

set_theme_mod( 'background_attachment', $attachment );
		}

if ( isset( $_POST['background-color'] ) ) {
			check_admin_referer( 'custom-background' );

$color = preg_replace( '/[^0-9a-fA-F]/', '', $_POST['background-color'] );

if ( strlen( $color ) === 6 || strlen( $color ) === 3 ) {
				set_theme_mod( 'background_color', $color );
			} else {
				set_theme_mod( 'background_color', '' );
			}
		}

$this->updated = true;
	}

/**
	 * Displays the custom background page.
	 *
	 * @since 3.0.0
	 */
	public function admin_page() {
		?>
<div class="wrap" id="custom-background">
<h1><?php _e( 'Custom Background' ); ?></h1>

<?php
		if ( current_user_can( 'customize' ) ) {
			$message = sprintf(
				/* translators: %s: URL to background image configuration in Customizer. */
				__( 'You can now manage and live-preview Custom Backgrounds in the <a href="%s">Customizer</a>.' ),
				admin_url( 'customize.php?autofocus[control]=background_image' )
			);
			wp_admin_notice(
				$message,
				array(
					'type'               => 'info',
					'additional_classes' => array( 'hide-if-no-customize' ),
				)
			);
		}

if ( ! empty( $this->updated ) ) {
			$updated_message = sprintf(
				/* translators: %s: Home URL. */
				__( 'Background updated. <a href="%s">Visit your site</a> to see how it looks.' ),
				esc_url( home_url( '/' ) )
			);
			wp_admin_notice(
				$updated_message,
				array(
					'id'                 => 'message',
					'additional_classes' => array( 'updated' ),
				)
			);
		}
		?>

<table class="form-table" role="presentation">
<tbody>
<tr>
<th scope="row"><?php echo esc_html_x( 'Preview', 'noun' ); ?></th>
<td>
		<?php
		if ( $this->admin_image_div_callback ) {
			call_user_func( $this->admin_image_div_callback );
		} else {
			$background_styles = '';
			$bgcolor           = get_background_color();
			if ( $bgcolor ) {
				$background_styles .= 'background-color: ' . maybe_hash_hex_color( $bgcolor ) . ';';
			}

$background_image_thumb = get_background_image();
			if ( $background_image_thumb ) {
				$background_image_thumb = esc_url( set_url_scheme( get_theme_mod( 'background_image_thumb', str_replace( '%', '%%', $background_image_thumb ) ) ) );
				$background_position_x  = get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) );
				$background_position_y  = get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) );
				$background_size        = get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) );
				$background_repeat      = get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) );
				$background_attachment  = get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) );

// Background-image URL must be single quote, see below.
				$background_styles .= " background-image: url('$background_image_thumb');"
				. " background-size: $background_size;"
				. " background-position: $background_position_x $background_position_y;"
				. " background-repeat: $background_repeat;"
				. " background-attachment: $background_attachment;";
			}
			?>
	<div id="custom-background-image" style="<?php echo $background_styles; ?>"><?php // Must be double quote, see above. ?>
			<?php if ( $background_image_thumb ) { ?>
		<img class="custom-background-image" src="<?php echo $background_image_thumb; ?>" style="visibility:hidden;" alt="" /><br />
		<img class="custom-background-image" src="<?php echo $background_image_thumb; ?>" style="visibility:hidden;" alt="" />
		<?php } ?>
	</div>
	<?php } ?>
</td>
</tr>

<?php if ( get_background_image() ) : ?>
<tr>
<th scope="row"><?php _e( 'Remove Image' ); ?></th>
<td>
<form method="post">
			<?php wp_nonce_field( 'custom-background-remove', '_wpnonce-custom-background-remove' ); ?>
			<?php submit_button( __( 'Remove Background Image' ), '', 'remove-background', false ); ?><br />
			<?php _e( 'This will remove the background image. You will not be able to restore any customizations.' ); ?>
</form>
</td>
</tr>
		<?php endif; ?>

<?php $default_image = get_theme_support( 'custom-background', 'default-image' ); ?>
		<?php if ( $default_image && get_background_image() !== $default_image ) : ?>
<tr>
<th scope="row"><?php _e( 'Restore Original Image' ); ?></th>
<td>
<form method="post">
			<?php wp_nonce_field( 'custom-background-reset', '_wpnonce-custom-background-reset' ); ?>
			<?php submit_button( __( 'Restore Original Image' ), '', 'reset-background', false ); ?><br />
			<?php _e( 'This will restore the original background image. You will not be able to restore any customizations.' ); ?>
</form>
</td>
</tr>
		<?php endif; ?>

<?php if ( current_user_can( 'upload_files' ) ) : ?>
<tr>
<th scope="row"><?php _e( 'Select Image' ); ?></th>
<td><form enctype="multipart/form-data" id="upload-form" class="wp-upload-form" method="post">
	<p>
		<label for="upload"><?php _e( 'Choose an image from your computer:' ); ?></label><br />
		<input type="file" id="upload" name="import" />
		<input type="hidden" name="action" value="save" />
			<?php wp_nonce_field( 'custom-background-upload', '_wpnonce-custom-background-upload' ); ?>
			<?php submit_button( _x( 'Upload', 'verb' ), '', 'submit', false ); ?>
	</p>
	<p>
		<label for="choose-from-library-link"><?php _e( 'Or choose an image from your media library:' ); ?></label><br />
		<button id="choose-from-library-link" class="button"
			data-choose="<?php esc_attr_e( 'Choose a Background Image' ); ?>"
			data-update="<?php esc_attr_e( 'Set as background' ); ?>"><?php _e( 'Choose Image' ); ?></button>
	</p>
	</form>
</td>
</tr>
		<?php endif; ?>
</tbody>
</table>

<?php
			$background_position_title = __( 'Image Position' );

$background_position = sprintf(
				'%s %s',
				get_theme_mod( 'background_position_x', get_theme_support( 'custom-background', 'default-position-x' ) ),
				get_theme_mod( 'background_position_y', get_theme_support( 'custom-background', 'default-position-y' ) )
			);

$background_position_options = array(
				array(
					'left top'   => array(
						'label' => __( 'Top Left' ),
						'icon'  => 'dashicons dashicons-arrow-left-alt',
					),
					'center top' => array(
						'label' => __( 'Top' ),
						'icon'  => 'dashicons dashicons-arrow-up-alt',
					),
					'right top'  => array(
						'label' => __( 'Top Right' ),
						'icon'  => 'dashicons dashicons-arrow-right-alt',
					),
				),
				array(
					'left center'   => array(
						'label' => __( 'Left' ),
						'icon'  => 'dashicons dashicons-arrow-left-alt',
					),
					'center center' => array(
						'label' => __( 'Center' ),
						'icon'  => 'background-position-center-icon',
					),
					'right center'  => array(
						'label' => __( 'Right' ),
						'icon'  => 'dashicons dashicons-arrow-right-alt',
					),
				),
				array(
					'left bottom'   => array(
						'label' => __( 'Bottom Left' ),
						'icon'  => 'dashicons dashicons-arrow-left-alt',
					),
					'center bottom' => array(
						'label' => __( 'Bottom' ),
						'icon'  => 'dashicons dashicons-arrow-down-alt',
					),
					'right bottom'  => array(
						'label' => __( 'Bottom Right' ),
						'icon'  => 'dashicons dashicons-arrow-right-alt',
					),
				),
			);
			?>
<tr>
<th scope="row"><?php echo $background_position_title; ?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php echo $background_position_title; ?></span></legend>
<div class="background-position-control">
			<?php foreach ( $background_position_options as $group ) : ?>
	<div class="button-group">
				<?php foreach ( $group as $value => $input ) : ?>
		<label>
			<input class="ui-helper-hidden-accessible" name="background-position" type="radio" value="<?php echo esc_attr( $value ); ?>"<?php checked( $value, $background_position ); ?>>
			<span class="button display-options position"><span class="<?php echo esc_attr( $input['icon'] ); ?>" aria-hidden="true"></span></span>
			<span class="screen-reader-text"><?php echo $input['label']; ?></span>
		</label>
	<?php endforeach; ?>
	</div>
<?php endforeach; ?>
</div>
</fieldset></td>
</tr>

<?php $image_size_title = __( 'Image Size' ); ?>
<tr>
<th scope="row"><label for="background-size"><?php echo $image_size_title; ?></label></th>
<td><fieldset><legend class="screen-reader-text"><span><?php echo $image_size_title; ?></span></legend>
<select id="background-size" name="background-size">
<option value="auto"<?php selected( 'auto', get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) ) ); ?>><?php _ex( 'Original', 'Original Size' ); ?></option>
<option value="contain"<?php selected( 'contain', get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) ) ); ?>><?php _e( 'Fit to Screen' ); ?></option>
<option value="cover"<?php selected( 'cover', get_theme_mod( 'background_size', get_theme_support( 'custom-background', 'default-size' ) ) ); ?>><?php _e( 'Fill Screen' ); ?></option>
</select>
</fieldset></td>
</tr>

<?php $background_repeat_title = _x( 'Repeat', 'Background Repeat' ); ?>
<tr>
<th scope="row"><?php echo $background_repeat_title; ?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php echo $background_repeat_title; ?></span></legend>
<input name="background-repeat" type="hidden" value="no-repeat">
<label><input type="checkbox" name="background-repeat" value="repeat"<?php checked( 'repeat', get_theme_mod( 'background_repeat', get_theme_support( 'custom-background', 'default-repeat' ) ) ); ?>> <?php _e( 'Repeat Background Image' ); ?></label>
</fieldset></td>
</tr>

<?php $background_scroll_title = _x( 'Scroll', 'Background Scroll' ); ?>
<tr>
<th scope="row"><?php echo $background_scroll_title; ?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php echo $background_scroll_title; ?></span></legend>
<input name="background-attachment" type="hidden" value="fixed">
<label><input name="background-attachment" type="checkbox" value="scroll" <?php checked( 'scroll', get_theme_mod( 'background_attachment', get_theme_support( 'custom-background', 'default-attachment' ) ) ); ?>> <?php _e( 'Scroll with Page' ); ?></label>
</fieldset></td>
</tr>
<?php endif; // get_background_image() ?>

<?php $background_color_title = __( 'Background Color' ); ?>
<tr>
<th scope="row"><?php echo $background_color_title; ?></th>
<td><fieldset><legend class="screen-reader-text"><span><?php echo $background_color_title; ?></span></legend>
		<?php
		$default_color = '';
		if ( current_theme_supports( 'custom-background', 'default-color' ) ) {
			$default_color = ' data-default-color="#' . esc_attr( get_theme_support( 'custom-background', 'default-color' ) ) . '"';
		}
		?>
<input type="text" name="background-color" id="background-color" value="#<?php echo esc_attr( get_background_color() ); ?>"<?php echo $default_color; ?>>
</fieldset></td>
</tr>
</tbody>
</table>

<?php wp_nonce_field( 'custom-background' ); ?>
		<?php submit_button( null, 'primary', 'save-background-options' ); ?>
</form>

</div>
		<?php
	}

/**
	 * Handles an Image upload for the background image.
	 *
	 * @since 3.0.0
	 */
	public function handle_upload() {
		if ( empty( $_FILES ) ) {
			return;
		}

check_admin_referer( 'custom-background-upload', '_wpnonce-custom-background-upload' );

$overrides = array( 'test_form' => false );

$uploaded_file = $_FILES['import'];
		$wp_filetype   = wp_check_filetype_and_ext( $uploaded_file['tmp_name'], $uploaded_file['name'] );
		if ( ! wp_match_mime_types( 'image', $wp_filetype['type'] ) ) {
			wp_die( __( 'The uploaded file is not a valid image. Please try again.' ) );
		}

$file = wp_handle_upload( $uploaded_file, $overrides );

if ( isset( $file['error'] ) ) {
			wp_die( $file['error'] );
		}

$url      = $file['url'];
		$type     = $file['type'];
		$file     = $file['file'];
		$filename = wp_basename( $file );

// Construct the attachment array.
		$attachment = array(
			'post_title'     => $filename,
			'post_content'   => $url,
			'post_mime_type' => $type,
			'guid'           => $url,
			'context'        => 'custom-background',
		);

// Save the data.
		$id = wp_insert_attachment( $attachment, $file );

// Add the metadata.
		wp_update_attachment_metadata( $id, wp_generate_attachment_metadata( $id, $file ) );
		update_post_meta( $id, '_wp_attachment_is_custom_background', get_option( 'stylesheet' ) );

set_theme_mod( 'background_image', sanitize_url( $url ) );

$thumbnail = wp_get_attachment_image_src( $id, 'thumbnail' );
		set_theme_mod( 'background_image_thumb', sanitize_url( $thumbnail[0] ) );

/** This filter is documented in wp-admin/includes/class-custom-image-header.php */
		$file = apply_filters( 'wp_create_file_in_uploads', $file, $id ); // For replication.

$this->updated = true;
	}

/**
	 * Handles Ajax request for adding custom background context to an attachment.
	 *
	 * Triggers when the user adds a new background image from the
	 * Media Manager.
	 *
	 * @since 4.1.0
	 *
	 * @return never
	 */
	public function ajax_background_add() {
		check_ajax_referer( 'background-add', 'nonce' );

if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_send_json_error();
		}

$attachment_id = absint( $_POST['attachment_id'] );
		if ( $attachment_id < 1 ) {
			wp_send_json_error();
		}

update_post_meta( $attachment_id, '_wp_attachment_is_custom_background', get_stylesheet() );

wp_send_json_success();
	}

/**
	 * @since 3.4.0
	 * @deprecated 3.5.0
	 *
	 * @param array $form_fields
	 * @return array $form_fields
	 */
	public function attachment_fields_to_edit( $form_fields ) {
		return $form_fields;
	}

/**
	 * @since 3.4.0
	 * @deprecated 3.5.0
	 *
	 * @param array $tabs
	 * @return array $tabs
	 */
	public function filter_upload_tabs( $tabs ) {
		return $tabs;
	}

/**
	 * @since 3.4.0
	 * @deprecated 3.5.0
	 *
	 * @return never
	 */
	public function wp_set_background_image() {
		check_ajax_referer( 'custom-background' );

if ( ! current_user_can( 'edit_theme_options' ) || ! isset( $_POST['attachment_id'] ) ) {
			exit;
		}

$attachment_id = absint( $_POST['attachment_id'] );

$sizes = array_keys(
			/** This filter is documented in wp-admin/includes/media.php */
			apply_filters(
				'image_size_names_choose',
				array(
					'thumbnail' => __( 'Thumbnail' ),
					'medium'    => __( 'Medium' ),
					'large'     => __( 'Large' ),
					'full'      => __( 'Full Size' ),
				)
			)
		);

$size = 'thumbnail';
		if ( in_array( $_POST['size'], $sizes, true ) ) {
			$size = esc_attr( $_POST['size'] );
		}

update_post_meta( $attachment_id, '_wp_attachment_is_custom_background', get_option( 'stylesheet' ) );

$url       = wp_get_attachment_image_src( $attachment_id, $size );
		$thumbnail = wp_get_attachment_image_src( $attachment_id, 'thumbnail' );
		set_theme_mod( 'background_image', sanitize_url( $url[0] ) );
		set_theme_mod( 'background_image_thumb', sanitize_url( $thumbnail[0] ) );
		exit;
	}
}

cmd: