How to parse Markdown in PHP?

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First, I know, there already is a Markdown parser for PHP. I also took a look to this question but it doesn\'t answer to my question.

Obviously, even if the title me

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心在旅途

2020-12-23 21:26

Ciconia - A New Markdown Parser for PHP is a good one I found.

You just need 3 things to do :

1.Install Ciconia and parse file according to the document.
2. Add corresponding css theme to make it nice, like github markdown style or here.
3. Add syntax highlighting javascript, like google Javascript code prettifier.

Then everything will look pretty good.

If you want a complete example, here is my working demo for github style markdown:

<?php
header("Content-Type: text/html;charset=utf-8");
require 'vendor/autoload.php';
use Ciconia\Ciconia;
use Ciconia\Extension\Gfm;

$ciconia = new Ciconia();
$ciconia->addExtension(new Gfm\FencedCodeBlockExtension());
$ciconia->addExtension(new Gfm\TaskListExtension());
$ciconia->addExtension(new Gfm\InlineStyleExtension());
$ciconia->addExtension(new Gfm\WhiteSpaceExtension());
$ciconia->addExtension(new Gfm\TableExtension());
$ciconia->addExtension(new Gfm\UrlAutoLinkExtension());
$contents = file_get_contents('Readme.md');
$html = $ciconia->render($contents);
?>
<!DOCTYPE html>
<html>
    <head>
        <title>Excel to Lua table - Readme</title>
        <script src="https://cdn.rawgit.com/google/code-prettify/master/loader/run_prettify.js"></script>
        <link rel="stylesheet" href="./github-markdown.css">
        <style>
            .markdown-body {
                box-sizing: border-box;
                min-width: 200px;
                max-width: 980px;
                margin: 0 auto;
                padding: 45px;
            }
        </style>
    </head>
    <body>
        <article class="markdown-body">
        <?php
            # Put HTML content in the document
            echo $html;
        ?>
        </article>
    </body>
</html>

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梦如初夏

2020-12-23 21:28

Using regexes.

<?php

/**
 * Slimdown - A very basic regex-based Markdown parser. Supports the
 * following elements (and can be extended via Slimdown::add_rule()):
 *
 * - Headers
 * - Links
 * - Bold
 * - Emphasis
 * - Deletions
 * - Quotes
 * - Inline code
 * - Blockquotes
 * - Ordered/unordered lists
 * - Horizontal rules
 *
 * Author: Johnny Broadway <johnny@johnnybroadway.com>
 * Website: https://gist.github.com/jbroadway/2836900
 * License: MIT
 */
class Slimdown {
    public static $rules = array (
        '/(#+)(.*)/' => 'self::header',                           // headers
        '/\[([^\[]+)\]\(([^\)]+)\)/' => '<a href=\'\2\'>\1</a>',  // links
        '/(\*\*|__)(.*?)\1/' => '<strong>\2</strong>',            // bold
        '/(\*|_)(.*?)\1/' => '<em>\2</em>',                       // emphasis
        '/\~\~(.*?)\~\~/' => '<del>\1</del>',                     // del
        '/\:\"(.*?)\"\:/' => '<q>\1</q>',                         // quote
        '/`(.*?)`/' => '<code>\1</code>',                         // inline code
        '/\n\*(.*)/' => 'self::ul_list',                          // ul lists
        '/\n[0-9]+\.(.*)/' => 'self::ol_list',                    // ol lists
        '/\n(&gt;|\>)(.*)/' => 'self::blockquote ',               // blockquotes
        '/\n-{5,}/' => "\n<hr />",                                // horizontal rule
        '/\n([^\n]+)\n/' => 'self::para',                         // add paragraphs
        '/<\/ul>\s?<ul>/' => '',                                  // fix extra ul
        '/<\/ol>\s?<ol>/' => '',                                  // fix extra ol
        '/<\/blockquote><blockquote>/' => "\n"                    // fix extra blockquote
    );

    private static function para ($regs) {
        $line = $regs[1];
        $trimmed = trim ($line);
        if (preg_match ('/^<\/?(ul|ol|li|h|p|bl)/', $trimmed)) {
            return "\n" . $line . "\n";
        }
        return sprintf ("\n<p>%s</p>\n", $trimmed);
    }

    private static function ul_list ($regs) {
        $item = $regs[1];
        return sprintf ("\n<ul>\n\t<li>%s</li>\n</ul>", trim ($item));
    }

    private static function ol_list ($regs) {
        $item = $regs[1];
        return sprintf ("\n<ol>\n\t<li>%s</li>\n</ol>", trim ($item));
    }

    private static function blockquote ($regs) {
        $item = $regs[2];
        return sprintf ("\n<blockquote>%s</blockquote>", trim ($item));
    }

    private static function header ($regs) {
        list ($tmp, $chars, $header) = $regs;
        $level = strlen ($chars);
        return sprintf ('<h%d>%s</h%d>', $level, trim ($header), $level);
    }

    /**
     * Add a rule.
     */
    public static function add_rule ($regex, $replacement) {
        self::$rules[$regex] = $replacement;
    }

    /**
     * Render some Markdown into HTML.
     */
    public static function render ($text) {
        $text = "\n" . $text . "\n";
        foreach (self::$rules as $regex => $replacement) {
            if (is_callable ( $replacement)) {
                $text = preg_replace_callback ($regex, $replacement, $text);
            } else {
                $text = preg_replace ($regex, $replacement, $text);
            }
        }
        return trim ($text);
    }
}


echo Slimdown::render ("# Title

And *now* [a link](http://www.google.com) to **follow** and [another](http://yahoo.com/).

* One
* Two
* Three

## Subhead

One **two** three **four** five.

One __two__ three _four_ five __six__ seven _eight_.

1. One
2. Two
3. Three

More text with `inline($code)` sample.

> A block quote
> across two lines.

More text...");

Origin https://gist.github.com/jbroadway/2836900

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余生分开走

2020-12-23 21:36

Also, there is an object-oriented implementation of Markdown which is faster: markdown-oo-php

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感情败类

2020-12-23 21:40

There is PHP Markdown Extra that seems to be popular, you could start by looking at its source.

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一生所求

2020-12-23 21:44

You should have a look at Parsedown.

It parses Markdown text the way people do. First, it divides texts into lines. Then it looks at how these lines start and relate to each other. Finally, it looks for special characters to identify inline elements.

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