-PHP has, in recent years, seen an emergence of eventware built atop potent multiplexing functions like `epoll()`, `poll()`, and `select()`. In event loops like `libev`, `libuv`, and `libevent` are powerful abstractions of the aforelisted functions for interleaving I/O inside a single process. Eponymous PHP extensions have, in the years since the popularization of the non-blocking I/O paradigm, been created to avail users of the language of the many potencies of the aforestated libraries. `io_uring` is yet another async system call API, and mrloop is an event loop built atop its interface. The former, which the latter is written atop—presents an enhancive proposition: unlike the commonplace non-blocking I/O APIs, it is a universal I/O interface with a small system call footprint. `io_uring` is, internally, a ring buffer—a structure the operations on which are of an **O(1)** complexity—whose mechanism is registration of a file descriptor on a submission queue and subsequent retrieval of output from a completion queue. It confers performance benefits that are useful to any project capable of interacting with its API and is thus useful to those for whom PHP is a preferred programming language.
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