Someone

if( $_POST['acceptfile'] ) {
  // Do a conversion on the uploaded file
//  echo ' receiving the uploaded file';
  $target_path = $target_path . basename($_FILES['filename']['name']);
  $path_parts = pathinfo($target_path);

  if( strcmp($path_parts['extension'],"wav") ) {
       echo "We don't accept other file formats except wav<br>";
  }  else {

  $target_path = "/var/www/html/veeramani/uploads/" . $extension . ".wav";
//   echo 'filename is ' . $target_path;
  if( move_uploaded_file($_FILES['filename']['tmp_name'],$target_path) ){
        echo ' file uploaded for conversion ';
  } else {
        echo 'problem uploading file';
        print_r($_FILES);
  }

  } // wav extension

}