// Load the Excel file $objPHPExcel = PHPExcel_IOFactory::load('example.xlsx'); // Get the document properties $properties = $objPHPExcel->getProperties(); // Get the author property $author = $properties->getCreator(); echo "Author: " . $author;In this example, we load the Excel file 'example.xlsx' using the PHPExcel_IOFactory::load() method. We then use the getProperties() method to retrieve the document properties, and finally use the getCreator() method to retrieve the author property. Based on the code, it can be determined that the package library used is PHPExcel.