PSR refers to PHP Standards Recommendations. These are specifications created and endorsed by the PHP Framework Interoperability Group (PHP-FIG) to standardize various aspects of PHP development. They aim to promote code interoperability and best practices across different PHP projects and frameworks. Common PSRs include PSR-4 (autoloading), PSR-7 (HTTP message interfaces), PSR-12 (coding style guide), and PSR-16 (simple cache interface).
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