How do I fix this error?

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PHP

I am building a script that takes every xls file from the /uploads folder and converts it to CSV.

But, I am having this error:
**Fatal error: Uncaught Error: Call to undefined function convertXLStoCSV() in C:\xampp\htdocs\Technocripa-php\scandir.php:46 Stack trace: #0 {main} thrown in C:\xampp\htdocs\Technocripa-php\scandir.php on line 46**

Here is the code:

$dir = "uploads/*";
    foreach(glob($dir) as $file)
    {
        if(!is_dir($file)) { echo basename($file)."\n";}
        //--------------------------
    
        $nameAsString = (string)$file;
    
        require_once('Classes/PHPExcel.php');
    
        $inputfilename = $nameAsString;
        $outputfilename = 'convert.csv';
    
        //Usage:
        convertXLStoCSV($inputfilename, $outputfilename);
    
        function convertXLStoCSV($infile, $outfile)
        {
            $fileType = PHPExcel_IOFactory::identify($infile);
            $objReader = PHPExcel_IOFactory::createReader($fileType);
    
            $objReader->setReadDataOnly(true);
            $objPHPExcel = $objReader->load($infile);
    
            $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'CSV');
            $objWriter->save($outfile);
        }
    }

I think the error comes from wrong variable usage, but I really can't find a way to fix this. All I want to is store the name of te file in the uploads/ folder in a variable and use it throughout my script.

Here's the program without the LOOP, it works without any errors. Maybe it helps to understand better.

require_once('Classes/PHPExcel.php');
    
      $inputfilename = 'test2.xls';
      $outputfilename = 'convert.csv';
    
      //Usage:
      convertXLStoCSV($inputfilename, $outputfilename);
    
      function convertXLStoCSV($infile, $outfile)
      {
          $fileType = PHPExcel_IOFactory::identify($infile);
          $objReader = PHPExcel_IOFactory::createReader($fileType);
    
          $objReader->setReadDataOnly(true);
          $objPHPExcel = $objReader->load($infile);
    
          $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'CSV');
          $objWriter->save($outfile);
      }

What I have tried:

To modify the code structure but with no result.