apply_filters( 'pre_wp_unique_filename_file_list', array|null $files, string $dir, string $filename )

2670			 *2671			 * @param array|null $files    The list of files to use for filename comparisons.2672			 *                             Default null (to retrieve the list from the filesystem).2673			 * @param string     $dir      The directory for the new file.2674			 * @param string     $filename The proposed filename for the new file.2675			 */2676			$files = apply_filters( 'pre_wp_unique_filename_file_list', null, $dir, $filename );2677 2678			if ( null === $files ) {2679				// List of all files and directories contained in $dir.2680				$files = @scandir( $dir );2681			}2682