<?php 
use PhpOffice\PhpSpreadsheet\IOFactory;
use PhpOffice\PhpSpreadsheet\Spreadsheet;
function csv_to_xlsx($csvFilePath, $outputFilePath, $delimiter= "\t")
{
    try {
        // Create a new Spreadsheet object
        $spreadsheet = new Spreadsheet();

        // Get the active sheet
        $sheet = $spreadsheet->getActiveSheet();

        // Open the CSV file
        $file = fopen($csvFilePath, 'r');
        if (!$file) {
            throw new \Exception("Cannot open CSV file.");
        }

        $rowIndex = 1;

        // Read each row and add it to the spreadsheet
        while (($row = fgetcsv($file, 0, $delimiter)) !== false) {
            $colIndex = 'A';

            foreach ($row as $cell) {
                // Veriyi hücreye yaz
             //   if($cell == "NULL") $cell = "";
                $sheet->setCellValue($colIndex . $rowIndex, $cell);
                $colIndex++;
            }

            $rowIndex++;
        }
        fclose($file);

        // Write to XLSX file
        $writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
        $writer->save($outputFilePath);

        return $outputFilePath;
        
    } catch (\Exception $e) {
        $result = [];
        $result['error'] = "Error: " . $e->getMessage();
        return $result;
    }
}


 ?>