PHP Simple Markdown Function

simplemarkdown.php

<?php
// source inspiration unknown
function markdownToHtml($markdown) {

     // Convert headers
    $markdown = preg_replace('/^###### (.*)$/m', '<h6>$1</h6>', $markdown);
    $markdown = preg_replace('/^##### (.*)$/m', '<h5>$1</h5>', $markdown);
    $markdown = preg_replace('/^#### (.*)$/m', '<h4>$1</h4>', $markdown);
    $markdown = preg_replace('/^### (.*)$/m', '<h3>$1</h3>', $markdown);
    $markdown = preg_replace('/^## (.*)$/m', '<h2>$1</h2>', $markdown);
    $markdown = preg_replace('/^# (.*)$/m', '<h1>$1</h1>', $markdown);

    // Convert bold text
    $markdown = preg_replace('/\*\*(.+?)\*\*/', '<strong>\1</strong>', $markdown);

    // Convert italic text
    $markdown = preg_replace('/\*(.+?)\*/', '<em>\1</em>', $markdown);

    // Convert links
    $markdown = preg_replace('/\[(.+?)\]\((.+?)\)/', '<a href="\2">\1</a>', $markdown);

    // Convert unordered lists
    $markdown = preg_replace('/^\s*-\s+(.+)$/m', '<li>\1</li>', $markdown);
    $markdown = preg_replace('/(<li>.*<\/li>)/s', '<ul>\1</ul>', $markdown);

    // Convert tables
    $markdown = preg_replace_callback(
        '/^\|(.+)\|\n\|(?:-+\|)+\n((?:\|.+\|\n)+)/m',
        function ($matches) {
            $headers = explode('|', trim($matches[1]));
            $rows = explode("\n", trim($matches[2]));

            $thead = '<thead><tr>';
            foreach ($headers as $header) {
                $thead .= '<th>' . trim($header) . '</th>';
            }
            $thead .= '</tr></thead>';

            $tbody = '<tbody>';
            foreach ($rows as $row) {
                $tbody .= '<tr>';
                $cells = explode('|', trim($row));
                foreach ($cells as $cell) {
                    $tbody .= '<td>' . trim($cell) . '</td>';
                }
                $tbody .= '</tr>';
            }
            $tbody .= '</tbody>';

            return '<table>' . $thead . $tbody . '</table>';
        },
        $markdown
    );

    // Convert line breaks
    // $markdown = nl2br($markdown);

    return $markdown;
}

// Example usage
$markdown = <<<EOD
# Header 1

## Header 2

**Bold Text**

*Italic Text*

[Link](https://example.com)

- Item 1
- Item 2

### Header 3

| Top | CODE | Model | Capacity | Power | Engine |
|-----|------|-------|----------|-------|--------|
| | AF30 | MAP1F1A15LV | 3000 | LP - G/LP | K21 |
| | AF35 | MAP1F1A18LV | 3500 | LP - G/LP | K21 |
| * | AF50 | MAP1F2A25LV | 5000 | LP - G/LP | K21 |
| * | CF30 | MCP1F1A15LV | 3000 | LP - G/LP | |
| | CF35 | | 3500 | LP - G/LP | EK21 |
| | CF40 | | 4000 | LP - G/LP | EK21 |
| | CFS40 | | 4000 | LP - G/LP | EK21 |
| | CFU40 | | 4000 | LP - G/LP | EK21 |
| * | CF50 | MCP1F2A25LV | 5000 | LP - G/LP | EK21 |
| | CFU50 || 5000 | LP - G/LP | EK21 |


EOD;

echo markdownToHtml($markdown);
?>