Stream::tell()

Source

public function tell(): int
{
    if (!isset($this->stream)) {
        throw new \RuntimeException('Stream is detached');
    }
    if (\false === $result = @\ftell($this->stream)) {
        throw new \RuntimeException('Unable to determine stream position: ' . (\error_get_last()['message'] ?? ''));
    }
    return $result;
}

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