我正在开发一个用php构建的网站。现在我重新设计它。当我在编辑器中打开任何网页时，会自动添加两行，一行在顶部，另一行在页面底部：
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这有害吗？请告诉我为什么出现这种情况，以及如何摆脱这种情况。
</body>
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</html>
<?php include_once 'conn.php' ?>
<!doctype html>
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<html lang="en" class="no-js">
<head>