Online PHP editor | output for 3Pf5Y

<?php declare(strict_types=1); stream_wrapper_register('fizzbuzz', FizzBuzzStreamWrapper::class); var_dump(fstat(fopen('fizzbuzz://22', 'r'))['size']); echo file_get_contents('fizzbuzz://22'); final class FizzBuzzStreamWrapper { private int $counter = 1; private int $length = 15; /** @var resource */ public $context; public function stream_open(string $path, $mode, $options, &$opened_path): bool { preg_match('#([\d]+$)#', $path, $matches); $this->length = filter_var( $matches[1] ?? '', FILTER_VALIDATE_INT, ['options' => ['default' => 15]] ); return true; } public function stream_read($count): string|false { if ($this->counter > $this->length) { return false; } $fizzbuzz = match (true) { $this->counter % 15 === 0 => 'FizzBuzz', $this->counter % 5 === 0 => 'Buzz', $this->counter % 3 === 0 => 'Fizz', default => (string)$this->counter }; $contents = ''; if ($this->counter === 1) { $contents = '<?php ' . PHP_EOL; } $contents .= "echo '{$fizzbuzz}' . PHP_EOL;"; $this->counter++; return $contents; } public function stream_close(): bool { return true; } public function stream_eof(): bool { return $this->counter ===$this->length; } public function stream_stat(): array|false { return ['size' => 0]; // return ['size' => $this->getSize()]; } public function stream_set_option(int $option, int $arg1, int $arg2) { return false; } private function getSize() { $ret = strlen("<?php \n") + $this->length * 18; $range = range(1, $this->length); $numbers = array_filter($range, fn ($n) => ($n % 3 !== 0 && $n % 5 !== 0)); $ret += strlen(implode('', $numbers)); $fizzOrBuzzs = array_filter($range, fn ($n) => ($n % 15 !== 0) && ($n % 3 === 0 || $n % 5 === 0)); $ret += strlen('fizz') * count($fizzOrBuzzs); $fizzbuzzs = array_filter($range, fn ($n) => ($n % 15 === 0)); $ret += strlen('fizzbuzz') * count($fizzbuzzs); return $ret; } }