Why Are My Mac Files Duplicated on NFS Shares? The Mystery of '._' Files Solved with PHP

Ever been puzzled by files mysteriously duplicating with a '._' prefix when working with NFS or SMB shares on macOS? These 'ghost' files are invisible in Finder and the terminal but appear in your program's file scans. This article dives deep into macOS's AppleDouble file system, explaining what '._' files are, why they're hidden, and provides an elegant PHP solution using Yii2's FileHelper to permanently filter them out of your scans.