PHP2Shell CVE-2026-109618: Fix and Interview Questions

PHP2Shell (CVE-2026-109618 and CVE-2026-109619): affected versions, the fix, and five interview questions on memory safety and stale state.

PHP2Shell (CVE-2026-109618 and CVE-2026-109619): affected versions, the fix, and five interview questions on memory safety and stale state.