prep for 2023. Fixed many bugs. Added pdf guide

vendor/phpoffice/phpspreadsheet/samples/Basic/16_Csv.php

@@ -0,0 +1,38 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+
+require __DIR__ . '/../Header.php';
+$spreadsheet = require __DIR__ . '/../templates/sampleSpreadsheet.php';
+
+$helper->log('Write to CSV format');
+$writer = IOFactory::createWriter($spreadsheet, 'Csv')->setDelimiter(',')
+    ->setEnclosure('"')
+    ->setSheetIndex(0);
+
+$callStartTime = microtime(true);
+$filename = $helper->getTemporaryFilename('csv');
+$writer->save($filename);
+$helper->logWrite($writer, $filename, $callStartTime);
+
+$helper->log('Read from CSV format');
+
+$reader = IOFactory::createReader('Csv')->setDelimiter(',')
+    ->setEnclosure('"')
+    ->setSheetIndex(0);
+
+$callStartTime = microtime(true);
+$spreadsheetFromCSV = $reader->load($filename);
+$helper->logRead('Csv', $filename, $callStartTime);
+
+// Write Xlsx
+$helper->write($spreadsheetFromCSV, __FILE__, ['Xlsx']);
+
+// Write CSV
+$filenameCSV = $helper->getFilename(__FILE__, 'csv');
+$writerCSV = IOFactory::createWriter($spreadsheetFromCSV, 'Csv');
+$writerCSV->setExcelCompatibility(true);
+
+$callStartTime = microtime(true);
+$writerCSV->save($filenameCSV);
+$helper->logWrite($writerCSV, $filenameCSV, $callStartTime);