All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

• check command (default) to compare .env files against .env.example
• diff command for full diff between any two env files
• list-vars command to list variables in an env file
• Missing variable detection with line number references
• Extra variable detection (variables in target but not in example)
• Empty value warnings when example has a non-empty default
• Multi-environment support via repeatable --env flag
• Proper .env parsing: comments, single/double quotes, escape sequences, export prefix, inline comments
• Text output with color-coded sections (missing, empty, extra)
• JSON output format for CI pipelines
• --strict flag to fail on extra variables
• --ci flag for CI mode (no color, exit 1 on any issue)
• --quiet flag to suppress output when no issues found
• --no-empty flag to suppress empty value warnings
• Graceful error messages for missing or unreadable files
• PHPStan max-level compliance
• 88 tests with 216 assertions