// Convert column index to column name $columnIndex = 10; // This would be the 10th column (column "J") $columnName = PHPExcel_Cell::stringFromColumnIndex($columnIndex); echo $columnName; // Output: "J"In this example, we use the PHPExcel_Cell stringFromColumnIndex function to convert the integer value 10 to its corresponding column name and then output the result. The PHPExcel library is no longer maintained and has been superseded by PhpSpreadsheet, a package that provides the same functionality but is actively maintained and updated.