Csv.php

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<?php
namespace Magento\Framework\File;

use Magento\Framework\Filesystem\Driver\File;

class Csv
{
    protected $_lineLength = 0;

    protected $_delimiter = ',';

    protected $_enclosure = '"';

    protected $file;

    public function __construct(File $file)
    {
        $this->file = $file;
    }

    public function setLineLength($length)
    {
        $this->_lineLength = $length;
        return $this;
    }

    public function setDelimiter($delimiter)
    {
        $this->_delimiter = $delimiter;
        return $this;
    }

    public function setEnclosure($enclosure)
    {
        $this->_enclosure = $enclosure;
        return $this;
    }

    public function getData($file)
    {
        $data = [];
        if (!file_exists($file)) {
            throw new \Exception('File "' . $file . '" does not exist');
        }

        $fh = fopen($file, 'r');
        while ($rowData = fgetcsv($fh, $this->_lineLength, $this->_delimiter, $this->_enclosure)) {
            $data[] = $rowData;
        }
        fclose($fh);
        return $data;
    }

    public function getDataPairs($file, $keyIndex = 0, $valueIndex = 1)
    {
        $data = [];
        $csvData = $this->getData($file);
        foreach ($csvData as $rowData) {
            if (isset($rowData[$keyIndex])) {
                $data[$rowData[$keyIndex]] = isset($rowData[$valueIndex]) ? $rowData[$valueIndex] : null;
            }
        }
        return $data;
    }

    public function saveData($file, $data)
    {
        return $this->appendData($file, $data, 'w');
    }

    public function appendData($file, $data, $mode = 'w')
    {
        $fileHandler = fopen($file, $mode);
        foreach ($data as $dataRow) {
            $this->file->filePutCsv($fileHandler, $dataRow, $this->_delimiter, $this->_enclosure);
        }
        fclose($fileHandler);

        return $this;
    }
}