The document discusses improving quality assurance on PHP projects through various tools. It introduces tools for syntax checking (PHPLint), documentation (PHPDocumentor), coding standards (PHP_CodeSniffer), duplication detection (PHPCPD), complexity/quality analysis (PDepend, PHPMD), testing (PHPUnit), packaging (Phar), and automation (Phing). Examples are provided of integrating these tools into a sample PHP project to continuously check code quality during development.