October 22, 2025 - Hayden's Server Room

PHP 버전 지원 정책 – EOS/EOL 일정 완벽 정리

웹 개발을 하다 보면 “PHP 버전을 업그레이드하라”는 메시지를 자주 접하게 됩니다. 하지만 막상 어떤 버전이 언제까지 지원되는지, 왜 업그레이드가 중요한지 […]

What Is RAG? How AI Learns to Stop Making Things Up
If you’ve ever watched an AI confidently state something completely wrong, you’ve witnessed hallucination firsthand. RAG — Retrieval-Augmented Generation — is the architectural pattern… Read more: What Is RAG? How AI Learns to Stop Making Things Up
Excel XLOOKUP #SPILL! Error: How to Fix!
If you’ve upgraded to Microsoft 365 and suddenly your XLOOKUP formulas are throwing a #SPILL! error where nothing used to fail — you’re not… Read more: Excel XLOOKUP #SPILL! Error: How to Fix!
Meta’s AI Glasses — The Post-Smartphone Era Is Already Here
In 2026, a device that surfaces information in your line of sight without pulling out your phone — and lets you control it with… Read more: Meta’s AI Glasses — The Post-Smartphone Era Is Already Here
Notion AI vs Obsidian : Who Wins the Productivity Tool War?
In 2026, the two giants of the productivity tool market are still Notion and Obsidian. One is a San Francisco unicorn valued at $10… Read more: Notion AI vs Obsidian : Who Wins the Productivity Tool War?
Why Discord Owns Gen Z’s Online Communities
Ask a Gen Z college student what app they use to hang out with friends online, and the answer probably isn’t Instagram DMs or… Read more: Why Discord Owns Gen Z’s Online Communities