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---
layout: default
title: Configuration
---
# Configuration
Many aspects of this library's behavior can be tweaked using configuration options.
You can provide an array of configuration options to the `Environment` or converter classes when creating them:
```php
$config = [
'renderer' => [
'block_separator' => "\n",
'inner_separator' => "\n",
'soft_break' => "\n",
],
'commonmark' => [
'enable_em' => true,
'enable_strong' => true,
'use_asterisk' => true,
'use_underscore' => true,
'unordered_list_markers' => ['-', '*', '+'],
],
'html_input' => 'escape',
'allow_unsafe_links' => false,
'max_nesting_level' => PHP_INT_MAX,
'slug_normalizer' => [
'max_length' => 255,
],
];
```
If you're using the basic `CommonMarkConverter` or `GithubFlavoredMarkdown` classes, simply pass the configuration array into the constructor:
```php
use League\CommonMark\CommonMarkConverter;
use League\CommonMark\GithubFlavoredMarkdownConverter;
$converter = new CommonMarkConverter($config);
// or
$converter = new GithubFlavoredMarkdownConverter($config);
```
Otherwise, if you're using `MarkdownConverter` to customize the extensions in your parser, pass the configuration into the [Environment](/2.2/customization/environment/)'s constructor instead:
```php
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\InlinesOnly\InlinesOnlyExtension;
use League\CommonMark\MarkdownConverter;
// Here's where we set the configuration array:
$environment = new Environment($config);
// TODO: Add any/all the extensions you wish; for example:
$environment->addExtension(new InlinesOnlyExtension());
// Go forth and convert you some Markdown!
$converter = new MarkdownConverter($environment);
```
Here's a list of the core configuration options available:
- `renderer` - Array of options for rendering HTML
- `block_separator` - String to use for separating renderer block elements
- `inner_separator` - String to use for separating inner block contents
- `soft_break` - String to use for rendering soft breaks
- `html_input` - How to handle HTML input. Set this option to one of the following strings:
- `strip` - Strip all HTML (equivalent to `'safe' => true`)
- `allow` - Allow all HTML input as-is (default value; equivalent to `'safe' => false)
- `escape` - Escape all HTML
- `allow_unsafe_links` - Remove risky link and image URLs by setting this to `false` (default: `true`)
- `max_nesting_level` - The maximum nesting level for blocks (default: `PHP_INT_MAX`). Setting this to a positive integer can help protect against long parse times and/or segfaults if blocks are too deeply-nested.
- `slug_normalizer` - Array of options for configuring how URL-safe slugs are created; see [the slug normalizer docs](/2.2/customization/slug-normalizer/#configuration) for more details
- `instance` - An alternative normalizer to use (defaults to the included `SlugNormalizer`)
- `max_length` - Limits the size of generated slugs (defaults to 255 characters)
- `unique` - Controls whether slugs should be unique per `'document'` (default) or per `'environment'`; can be disabled with `false`
Additional configuration options are available for most of the [available extensions](/2.2/customization/extensions/) - refer to their individual documentation for more details. For example, the CommonMark core extension offers these additional options:
- `commonmark` - Array of options for configuring the CommonMark core extension:
- `enable_em` - Disable `<em>` parsing by setting to `false`; enable with `true` (default: `true`)
- `enable_strong` - Disable `<strong>` parsing by setting to `false`; enable with `true` (default: `true`)
- `use_asterisk` - Disable parsing of `*` for emphasis by setting to `false`; enable with `true` (default: `true`)
- `use_underscore` - Disable parsing of `_` for emphasis by setting to `false`; enable with `true` (default: `true`)
- `unordered_list_markers` - Array of characters that can be used to indicate a bulleted list (default: `["-", "*", "+"]`)
## Environment
The configuration is ultimately passed to (and managed via) the `Environment`. If you're creating your own `Environment`, simply pass your config array into its constructor instead.
[Learn more about customizing the Environment](/2.2/customization/environment/)
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