Using an existing spreadsheet as a template PHPspreadsheet - phpspreadsheet

Question

Objective
I want to use an existing Excel sheet, as a template to create an invoice.
Cell styling, such as coloring have to be included
An image (logo) has to be included
Standard data such as company address has to be included
I've read something about cfspreadsheet, but I'm not entirely sure how to use it.
Question A:
Is there a way to use a template file? Or do you know any alternatives?
Question B
Is it possible to use $_POST data with this library?
Example
$data = $_POST['example'];
$spreadsheet = new Spreadsheet();
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', '$data');

Answer 1

I am not 100% sure, but according to PhpSpreadsheet's doc, you can read a local file (your pre-made template) with :
$inputFileName = './sampleData/example1.xls';
/** Load $inputFileName to a Spreadsheet Object **/
$spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($inputFileName);
Or in case you already know the file type (.xlsx or .xsl) :
$inputFileType = 'Xls'; // Xlsx - Xml - Ods - Slk - Gnumeric - Csv
$inputFileName = './sampleData/example1.xls';
/** Create a new Reader of the type defined in $inputFileType **/
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);
/** Load $inputFileName to a Spreadsheet Object **/
$spreadsheet = $reader->load($inputFileName);
You can also wrap all of that in a try catch if you want.
Then you just have to make changes the same way you would populate a Spreadsheet you created, populating cells with data you get from pretty much where you want with php, examples :
Classic variable $foo = 'bar';
$_GET / $_POST / $_REQUEST
From a Database