Online PHP editor | refs for P9Y9A

<?php $f = new SplFileObject('php://memory', 'r+'); assert('$f instanceof Iterator'); $f->fwrite("line 1"); $f->rewind(); assert('$f->valid() === true'); assert('$f->eof() === false'); assert('$f->current() === "line 1"'); assert('$f->valid() === true'); // fails assert('$f->eof() === true');