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See Release Notes

  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.
<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Ods;

use PhpOffice\PhpSpreadsheet\Spreadsheet;

class Mimetype extends WriterPart
{
    /**
     * Write mimetype to plain text format.
     *
     * @param Spreadsheet $spreadsheet
     *
     * @return string XML Output
     */
< public function write(Spreadsheet $spreadsheet = null)
> public function write(?Spreadsheet $spreadsheet = null)
{ return 'application/vnd.oasis.opendocument.spreadsheet'; } }