Online PHP editor | output for 5dYAL

<?php declare(strict_types=1); const LINES = 5; const INDEX = 10; $file = new SplFileObject('/tmp/test.txt', 'w+'); // write to files for ($i = 0; $i < LINES; $i++) { $file->fwrite("line {$i}" . PHP_EOL); } // behaviour of next() $file->rewind(); for ($i = 0; $i < INDEX; $file->next(), $i++); echo 'next(): ', $file->key(), PHP_EOL; // behaviour of seek() $file->rewind(); $file->seek(INDEX); echo 'seek(): ', $file->key(), PHP_EOL;