delete_theme( string $stylesheet, string $redirect = '' ): bool|null|WP_Error

21function delete_theme( $stylesheet, $redirect = '' ) {22	global $wp_filesystem;23 24	if ( empty( $stylesheet ) ) {25		return false;26	}27 28	if ( empty( $redirect ) ) {29		$redirect = wp_nonce_url( 'themes.php?action=delete&stylesheet=' . urlencode( $stylesheet ), 'delete-theme_' . $stylesheet );30	}31 32	ob_start();33	$credentials = request_filesystem_credentials( $redirect );34	$data        = ob_get_clean();35 36	if ( false === $credentials ) {37		if ( ! empty( $data ) ) {38			require_once ABSPATH . 'wp-admin/admin-header.php';39			echo $data;40			require_once ABSPATH . 'wp-admin/admin-footer.php';41			exit;42		}43		return null;44	}45 46	if ( ! WP_Filesystem( $credentials ) ) {47		ob_start();48		// Failed to connect. Error and request again.49		request_filesystem_credentials( $redirect, '', true );50		$data = ob_get_clean();51 52		if ( ! empty( $data ) ) {53			require_once ABSPATH . 'wp-admin/admin-header.php';54			echo $data;55			require_once ABSPATH . 'wp-admin/admin-footer.php';56			exit;57		}58		return null;59	}60 61	if ( ! is_object( $wp_filesystem ) ) {62		return new WP_Error( 'fs_unavailable', __( 'Could not access filesystem.' ) );63	}64 65	if ( is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {66		return new WP_Error( 'fs_error', __( 'Filesystem error.' ), $wp_filesystem->errors );67	}68 69	// Get the base theme folder.70	$themes_dir = $wp_filesystem->wp_themes_dir();71	if ( empty( $themes_dir ) ) {72		return new WP_Error( 'fs_no_themes_dir', __( 'Unable to locate WordPress theme directory.' ) );73	}74 75	/**76	 * Fires immediately before a theme deletion attempt.77	 *78	 * @since 5.8.079	 *80	 * @param string $stylesheet Stylesheet of the theme to delete.81	 */82	do_action( 'delete_theme', $stylesheet );83 84	$theme = wp_get_theme( $stylesheet );85 86	$themes_dir = trailingslashit( $themes_dir );87	$theme_dir  = trailingslashit( $themes_dir . $stylesheet );88	$deleted    = $wp_filesystem->delete( $theme_dir, true );89 90	/**91	 * Fires immediately after a theme deletion attempt.92	 *93	 * @since 5.8.094	 *95	 * @param string $stylesheet Stylesheet of the theme to delete.96	 * @param bool   $deleted    Whether the theme deletion was successful.97	 */98	do_action( 'deleted_theme', $stylesheet, $deleted );99 100	if ( ! $deleted ) {