vikpe/php-html-heading-normalizer

# PHP: HTML Heading Normalizer
PHP class for normalizing (promote/demote) HTML headings.

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## Installation
```
composer require vikpe/php-html-heading-normalizer
```

## Methods
### promote(string $html, int $numberOfLevels)
Promotes all headings in `$html` by `$numberOfLevels` levels.

```php
\Vikpe\HtmlHeadingNormalizer::promote('<h6>Foo</h6>', 3); // '<h3>Foo</h3>'
```

### demote(string $html, int $numberOfLevels)
Demotes all headings in `$html` by `$numberOfLevels` levels.
```php
\Vikpe\HtmlHeadingNormalizer::demote('<h1>Foo</h1>', 1); // '<h2>Foo</h2>'
```

### min(string $html, int $minLevel)
Promotes/demotes all headings in `$html` so that the lowest heading level equals `$minLevel`.
```php
\Vikpe\HtmlHeadingNormalizer::min('<h4>Foo</h4><h5>Bar</h5>', 1); // '<h1>Foo</h1><h2>Bar</h2>'
```