Filesystem/CsvResource.php
public function seek($offset): int
    {
        $this->assertOpened();
        $this->seekCalled = true;

        return fseek($this->handler, $offset);
    }
public function seek($offset): int
    {
        $this->assertOpened();
        $this->seekCalled = true;

        return fseek($this->handler, $offset);
    }
@param int $offset

@throws \RuntimeException

@return int