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docker-base-images-knowledge

Docker base images knowledge base for PHP. Provides image selection guidelines, Alpine vs Debian comparison, and version pinning strategies.

skills/docker-base-images-knowledge/SKILL.md

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# Docker Base Images Knowledge Base for PHP

Guidelines for selecting and managing PHP Docker base images.

## PHP Official Images Overview

| Image Tag Pattern | Base OS | Size | Use Case |
|-------------------|---------|------|----------|
| `php:8.4-fpm` | Debian Bookworm | ~480MB | Production FPM (full compatibility) |
| `php:8.4-fpm-alpine` | Alpine 3.20 | ~80MB | Production FPM (minimal size) |
| `php:8.4-cli` | Debian Bookworm | ~450MB | CLI scripts, cron jobs, workers |
| `php:8.4-cli-alpine` | Alpine 3.20 | ~50MB | Lightweight CLI tasks |
| `php:8.4-apache` | Debian Bookworm | ~500MB | All-in-one Apache+PHP |
| `php:8.4-zts` | Debian Bookworm | ~460MB | Thread-safe (parallel ext) |