> For the complete documentation index, see [llms.txt](https://antonshevchuk.gitbook.io/php-for-beginners/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://antonshevchuk.gitbook.io/php-for-beginners/60_oop/spl.md).

# SPL