I’m polishing a small personal project and have hit a snag: the session data that should flow smoothly from one PHP page to the next stops short, so values that were set simply vanish on subsequent pages. The problem shows up on just a handful of files—no more than four—and I’m confident everything else in the app is solid once this link is restored. Here’s what I need from you: • Pinpoint why my session data isn’t carrying over correctly between the affected pages. • Apply a clean, reliable fix and confirm the values remain intact through each page transition. Everything is built with plain PHP sessions—no frameworks, nothing exotic—so a sharp eye for $_SESSION handling, headers, and any subtle output-before-session-start pitfalls is key. Once the data flows reliably again and you walk me through the change set, we’re done.