title: Can I create multiselect dropdown using PhpSpreadsheet?
body: <p>Is it possible to create a multiselect dropdown ?</p>
  
  <p>Excel allow to create dropdown choices with VBA, but I didn't find an option generating an excel and added multiselect dropdown with PhpSpreadsheet.</p>
  
  <p>I found samples only single dropdown.</p>
  
  <pre><code>$validation = $spreadsheet-&gt;getActiveSheet()-&gt;getCell('B5')-&gt;getDataValidation();
  $validation-&gt;setType( \PhpOffice\PhpSpreadsheet\Cell\DataValidation::TYPE_LIST );
  $validation-&gt;setErrorStyle( \PhpOffice\PhpSpreadsheet\Cell\DataValidation::STYLE_INFORMATION );
  $validation-&gt;setAllowBlank(false);
  $validation-&gt;setShowInputMessage(true);
  $validation-&gt;setShowErrorMessage(true);
  $validation-&gt;setShowDropDown(true);
  $validation-&gt;setErrorTitle('Input error');
  $validation-&gt;setError('Value is not in list.');
  $validation-&gt;setPromptTitle('Pick from list');
  $validation-&gt;setPrompt('Please pick a value from the drop-down list.');
  $validation-&gt;setFormula1('"Item A,Item B,Item C"');
  </code></pre>
  
  <p><a href="https://phpspreadsheet.readthedocs.io/en/develop/topics/recipes/" rel="nofollow noreferrer">https://phpspreadsheet.readthedocs.io/en/develop/topics/recipes/</a></p>