Option to Write Hyperlink Rather than Label to Csv

Fix PHPOffice#1412 which had gone stale and which I've reopened. Add boolean property `preferHyperlinkToLabel` with setter and getter to Csv Writer. Default is false, so no BC problems; in addition, true will probably add quite a bit of overhead.

src/PhpSpreadsheet/Writer/Csv.php

@@ -62,6 +62,8 @@ class Csv extends BaseWriter
      */
     private bool $variableColumns = false;
 
+    private bool $preferHyperlinkToLabel = false;
+
     /**
      * Create a new CSV.
      */
@@ -123,6 +125,14 @@ public function save($filename, int $flags = 0): void
                     array_splice($cellsArray, Coordinate::columnIndexFromString($column));
                 }
             }
+            if ($this->preferHyperlinkToLabel) {
+                foreach ($cellsArray as $key => $value) {
+                    $url = $sheet->getCell([$key + 1, $row])->getHyperlink()->getUrl();
+                    if ($url !== '') {
+                        $cellsArray[$key] = $url;
+                    }
+                }
+            }
             $this->writeLine($this->fileHandle, $cellsArray);
         }
 
@@ -341,4 +351,22 @@ public function setVariableColumns(bool $pValue): self
 
         return $this;
     }
+
+    /**
+     * Get whether hyperlink or label should be output.
+     */
+    public function getPreferHyperlinkToLabel(): bool
+    {
+        return $this->preferHyperlinkToLabel;
+    }
+
+    /**
+     * Set whether hyperlink or label should be output.
+     */
+    public function setPreferHyperlinkToLabel(bool $preferHyperlinkToLabel): self
+    {
+        $this->preferHyperlinkToLabel = $preferHyperlinkToLabel;
+
+        return $this;
+    }
 }

tests/PhpSpreadsheetTests/Writer/Csv/HyperlinkTest.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Csv;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Writer\Csv;
+use PHPUnit\Framework\TestCase;
+
+class HyperlinkTest extends TestCase
+{
+    public function testVariableColumns(): void
+    {
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+        $sheet->setCellValue('A1', 3);
+        $sheet->setCellValue('B1', 4);
+        $sheet->setCellValue('C1', 5);
+        $sheet->setCellValue('A2', 6);
+        $sheet->setCellValue('B2', 'hyperlink');
+        $sheet->getCell('B2')->getHyperlink()
+            ->setUrl('http://www.example.com');
+        $sheet->setCellValue('C2', 8);
+
+        $fh = fopen('php://memory', 'r+b');
+        self::assertNotFalse($fh);
+        $writer = new Csv($spreadsheet);
+        self::assertFalse($writer->getPreferHyperlinkToLabel());
+        $writer->setEnclosureRequired(false)->setLineEnding("\n");
+        $writer->save($fh);
+        rewind($fh);
+        self::assertSame(
+            "3,4,5\n6,hyperlink,8\n",
+            stream_get_contents($fh)
+        );
+
+        rewind($fh);
+        $writer->setPreferHyperlinkToLabel(true);
+        $writer->save($fh);
+        rewind($fh);
+        self::assertSame(
+            "3,4,5\n6,http://www.example.com,8\n",
+            stream_get_contents($fh)
+        );
+        fclose($fh);
+        $spreadsheet->disconnectWorksheets();
+    }
+}