prep for 2023. Fixed many bugs. Added pdf guide

vendor/phpoffice/phpspreadsheet/samples/Basic/07_Reader.php

@@ -0,0 +1,19 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
+
+require __DIR__ . '/../Header.php';
+
+// Create temporary file that will be read
+$sampleSpreadsheet = require __DIR__ . '/../templates/sampleSpreadsheet.php';
+$filename = $helper->getTemporaryFilename();
+$writer = new Xlsx($sampleSpreadsheet);
+$writer->save($filename);
+
+$callStartTime = microtime(true);
+$spreadsheet = IOFactory::load($filename);
+$helper->logRead('Xlsx', $filename, $callStartTime);
+
+// Save
+$helper->write($spreadsheet, __FILE__);