eio_init (re-)initializes Eio. It allocates memory for internal structures of libeio and Eio itself. You may call eio_init before using Eio functions. Otherwise it will be called internally first time you invoke an Eio function in a process.
This function was removed in version 3.0.0RC1 of the eio extension for PHP version 8 and higher.
This function has no parameters.
No value is returned.