PhpSpreadsheet/samples/41_Password.php

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<?php
require __DIR__ . '/Header.php';
$spreadsheet = require __DIR__ . '/templates/sampleSpreadsheet.php';
// Set password against the spreadsheet file
$spreadsheet->getSecurity()->setLockWindows(true);
$spreadsheet->getSecurity()->setLockStructure(true);
$spreadsheet->getSecurity()->setWorkbookPassword('secret');
// Save
$helper->write($spreadsheet, __FILE__);