PHPStan is a static analysis tool designed to help developers write better, more maintainable code in PHP. It achieves this by analyzing the code's syntax, structure, and type hints, providing feedback on potential issues such as bugs, security vulnerabilities, and performance optimization opportunities. With its release of version 1.0, PHPStan offers improved features and capabilities, including support for multiple rule levels, baseline configuration, and integration with CI/CD pipelines. By using PHPStan, developers can identify and address tech debt, improve code quality, and reduce the risk of introducing bugs or security vulnerabilities into their applications.