有没有办法在不使用任何phpexcel库的情况下编写xlsx文件？

<?php
// 创建基本的文件夹和文件结构
mkdir('example');
mkdir('example/_rels');
mkdir('example/xl');
mkdir('example/xl/_rels');
mkdir('example/xl/worksheets');

// 创建[Content_Types].xml文件
$contentTypesXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
    <Default Extension="xml" ContentType="application/xml"/>
    <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
    <Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>
    <Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
</Types>';

file_put_contents('example/[Content_Types].xml', $contentTypesXml);

// 创建_rels/.rels文件
$relsXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
    <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>
</Relationships>';

file_put_contents('example/_rels/.rels', $relsXml);

// 创建xl/_rels/workbook.xml.rels文件
$workbookRelsXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
    <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/>
</Relationships>';

file_put_contents('example/xl/_rels/workbook.xml.rels', $workbookRelsXml);

// 创建xl/workbook.xml文件
$workbookXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <sheets>
        <sheet name="Sheet1" sheetId="1" r:id="rId1"/>
    </sheets>
</workbook>';

file_put_contents('example/xl/workbook.xml', $workbookXml);

// 创建xl/worksheets/sheet1.xml文件
$worksheetXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <sheetData>
        <row>
            <c r="A1">
                <v>Example Value</v>
            </c>
        </row>
    </sheetData>
</worksheet>';

file_put_contents('example/xl/worksheets/sheet1.xml', $worksheetXml);

// 创建[Content_Types].xml.rels文件
$contentTypesRelsXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
    <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="../example.xlsx"/>
</Relationships>';

file_put_contents('example/_rels/[Content_Types].xml.rels', $contentTypesRelsXml);

// 压缩生成的文件和文件夹为xlsx文件
$zip = new ZipArchive();
$zip->open('example.xlsx', ZipArchive::CREATE | ZipArchive::OVERWRITE);
$files = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator('example'),
    RecursiveIteratorIterator::LEAVES_ONLY
);

foreach ($files as $name => $file) {
    if (!$file->isDir()) {
        $filePath = $file->getRealPath();
        $relativePath = 'example/' . substr($filePath, strlen('example') + 1);
        $zip->addFile($filePath, $relativePath);
    }
}

$zip->close();

// 删除生成的文件夹
array_map('unlink', glob('example/*.*'));
rmdir('example');
?>