为什么我的html markdown输出错误？

Question

I am using the html-to-markdown library, to print the markdown for a h1/h2 tag, but see that it is printing wrong. I believe the sample output should be:

Test H1

but it gets printed as:

Test H1 =======

Not sure what is going wrong, but i don't see any errors either. The code prints correctly for h3 to h6 tags, but not for h1 and h2 tags.

<?php
require 'vendor/autoload.php';
use League\HTMLToMarkdown\HtmlConverter;

$converter = new HtmlConverter();

$html = "<h1>Test H1</h1>";
echo $html.'<br><br>';
$markdown = $converter->convert($html);
echo $markdown.'<br>'; exit;

Answer 1

It's using an alternative syntax, see on wikipedia

It should be correctly interpreted by a classic markdown parser.

And it's said in Github that this is this underlined style that is used by your library. See on github on how to change that