Fix GH-8561, GH-8562, GH-8563, GH-8564: SplFileObject iterator desync#21679

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iliaal wants to merge 4 commits intophp:masterfrom

iliaal:fix/gh-8562-splfileobject-next-current

Commits on Apr 8, 2026

Fix GH-8562: SplFileObject::current() returns wrong value after next()
iliaal
committed

Commits on Apr 9, 2026

Fix GH-8561: SplFileObject key()/current() desync after fgets()
iliaal
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Fix GH-8563, GH-8564: SplFileObject EOF handling for seek() and next()
iliaal
committed

Commits on Apr 10, 2026

Refine fgets() to reuse cached line when present
iliaal
committed