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PHP
Recursive Deep Merge
Merge two associative arrays at any nesting depth — like array_merge_recursive, but later values OVERWRITE earlier ones at the leaf level instead of combining them into arrays. Perfect for config-file overrides.
@admin
Go
os.Getenv with Defaults
`os.Getenv` returns "" when unset — easy to miss. Wrap it with a typed helper that supplies defaults and parses numerics. Saves boilerplate at every config-read site.
Bash
Idempotent Append to File
Add a line to a file (e.g., a config or PATH export) only if it isn't already present. Common in install/setup scripts that need to be safe to re-run.
Python
Stdlib .env Loader (no dependency)
Parse a `.env` file into a dict and optionally export to os.environ. Skips comments and blank lines, strips surrounding quotes — no python-dotenv dependency needed.
Bash
Source Multiple Files from Directory
A common ~/.bashrc / ~/.zshrc pattern: split your config into ~/.bashrc.d/*.sh and source them all. Easier than one giant file.