Reorganize Samples

The samples have become unwieldy when running them from a browser. In particular, the drop-down lists are fixed size with no scrolling, and many of them are now just too large. I have moved all the Calculation samples up a level, and broken several categories (Basic, Chart, DateTime, Engineering, Financial, and Reader) into several pieces.

Convert-Online (now found in the Engineering category) had a number of different problems which are now resolved. It is the only member with any significant code change.

samples/Basic2/26_Utf8.php

@@ -0,0 +1,55 @@
+<?php
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PhpOffice\PhpSpreadsheet\Writer\Csv;
+use PhpOffice\PhpSpreadsheet\Writer\Pdf\Mpdf;
+
+require __DIR__ . '/../Header.php';
+
+// Read from Xlsx (.xlsx) template
+$helper->log('Load Xlsx template file');
+$reader = IOFactory::createReader('Xlsx');
+$spreadsheet = $reader->load(__DIR__ . '/../templates/26template.xlsx');
+$spreadsheet->getActiveSheet()->setPrintGridlines(true);
+
+// at this point, we could do some manipulations with the template, but we skip this step
+$helper->write($spreadsheet, __FILE__, ['Xlsx', 'Xls', 'Html']);
+
+// Export to PDF (mpdf)
+$mpdfCjkWriter = function (Mpdf $writer): void {
+    $mpdfCjk = function (string $html): string {
+        $html = str_replace("'Calibri'", "'Calibri',Sun-ExtA", $html);
+
+        return str_replace("'Times New Roman'", "'Times New Roman',Sun-ExtA", $html);
+    };
+
+    $writer->setEditHtmlCallback($mpdfCjk);
+};
+
+$helper->log('Write to Mpdf');
+IOFactory::registerWriter('Pdf', Mpdf::class);
+$filename = __FILE__;
+$helper->write($spreadsheet, $filename, ['Pdf'], false, $mpdfCjkWriter);
+
+// Remove first two rows with field headers before exporting to CSV
+$helper->log('Removing first two heading rows for CSV export');
+$worksheet = $spreadsheet->getActiveSheet();
+$worksheet->removeRow(1, 2);
+
+// Export to CSV (.csv)
+$helper->log('Write to CSV format');
+/** @var Csv $writer */
+$helper->write($spreadsheet, __FILE__, ['Csv']);
+
+// Export to CSV with BOM (.csv)
+$filename = str_replace('.php', '-bom.php', __FILE__);
+$helper->log('Write to CSV format (with BOM)');
+$helper->write(
+    $spreadsheet,
+    $filename,
+    ['Csv'],
+    false,
+    function (Csv $writer): void {
+        $writer->setUseBOM(true);
+    }
+);