WP_Filesystem_Direct::delete( string $file, bool $recursive = false, string|false $type = false ): bool

401	public function delete( $file, $recursive = false, $type = false ) {402		if ( empty( $file ) ) {403			// Some filesystems report this as /, which can cause non-expected recursive deletion of all files in the filesystem.404			return false;405		}406 407		$file = str_replace( '\\', '/', $file ); // For Win32, occasional problems deleting files otherwise.408 409		if ( 'f' === $type || $this->is_file( $file ) ) {410			return @unlink( $file );411		}412 413		if ( ! $recursive && $this->is_dir( $file ) ) {414			return @rmdir( $file );415		}416 417		// At this point it's a folder, and we're in recursive mode.418		$file     = trailingslashit( $file );419		$filelist = $this->dirlist( $file, true );420 421		$retval = true;422 423		if ( is_array( $filelist ) ) {424			foreach ( $filelist as $filename => $fileinfo ) {425				if ( ! $this->delete( $file . $filename, $recursive, $fileinfo['type'] ) ) {426					$retval = false;427				}428			}429		}430 431		if ( file_exists( $file ) && ! @rmdir( $file ) ) {432			$retval = false;433		}434 435		return $retval;436	}