PHP Notice: unserialize(): Error at offset 8201 of 44790 bytes in /tmp/photos_dat_parse.php on line 4
It is so miserable if you found your old PHP modules serialized data corrupted and there is __NO__ backup file existed.
e.g. "Menalto Gallery" version-1/2 PHOTOS.DAT or ALBUMS.DAT corrupted, yet none sane backup serialized file remained.
The following tools may __SOMETIMES__ help to repair the broken serialized data, but remember NOT-always.
No matter you can fix it or not,
TRY __not__ to store data in serialized format
as possible as you can, especially when the data will be with R+W transactions because it is usually hard to fix even manually by human-parser.