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:clamp: HtmlMin: HTML Compressor and Minifier via PHP

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# :clamp: HtmlMin: HTML Compressor and Minifier for PHP

### Description

HtmlMin is a fast and very easy to use PHP library that minifies given HTML5 source by removing extra whitespaces, comments and other unneeded characters without breaking the content structure. As a result pages become smaller in size and load faster. It will also prepare the HTML for better gzip results, by re-ranging (sort alphabetical) attributes and css-class-names.

### Install via "composer require"

```shell
composer require voku/html-min
```

### Quick Start

```php
use voku\helper\HtmlMin;

$html = "
<html>
  \r\n\t
  <body>
    <ul style=''>
      <li style='display: inline;' class='foo'>
        \xc3\xa0
      </li>
      <li class='foo' style='display: inline;'>
        \xc3\xa1
      </li>
    </ul>
  </body>
  \r\n\t
</html>
";
$htmlMin = new HtmlMin();

echo $htmlMin->minify($html); 
// '<html><body><ul><li class=foo style="display: inline;"> à <li class=foo style="display: inline;"> á </ul>'
```

### Options

```php
use voku\helper\HtmlMin;

$htmlMin = new HtmlMin();

/* 
 * Protected HTML (inline css / inline js / conditional comments) are still protected,
 *    no matter what settings you use.
 */

$htmlMin->doOptimizeViaHtmlDomParser();               // optimize html via "HtmlDomParser()"
$htmlMin->doRemoveComments();                         // remove default HTML comments (depends on "doOptimizeViaHtmlDomParser(true)")
$htmlMin->doRemoveCommentsOnly();                     // remove HTML comments only, without changing any other HTML
$htmlMin->doSumUpWhitespace();                        // sum-up extra whitespace from the Dom (depends on "doOptimizeViaHtmlDomParser(true)")
$htmlMin->doRemoveWhitespaceAroundTags();             // remove whitespace around tags (depends on "doOptimizeViaHtmlDomParser(true)")
$htmlMin->doOptimizeAttributes();                     // optimize html attributes (depends on "doOptimizeViaHtmlDomParser(true)")
$htmlMin->doRemoveHttpPrefixFromAttributes();         // remove optional "http:"-prefix from attributes (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveHttpsPrefixFromAttributes();        // remove optional "https:"-prefix from attributes (depends on "doOptimizeAttributes(true)")
$htmlMin->doKeepHttpAndHttpsPrefixOnExternalAttributes(); // keep "http:"- and "https:"-prefix for all external links 
$htmlMin->setLocalDomains(['example.com'])->doMakeSameDomainsLinksRelative(); // make some links relative, by removing the domain from attributes
$htmlMin->doRemoveDefaultAttributes();                // remove defaults (depends on "doOptimizeAttributes(true)" | disabled by default)
$htmlMin->doRemoveDeprecatedAnchorName();             // remove deprecated anchor-jump (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveDeprecatedScriptCharsetAttribute(); // remove deprecated charset-attribute - the browser will use the charset from the HTTP-Header, anyway (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveDeprecatedTypeFromScriptTag();      // remove deprecated script-mime-types (depends on "doOptimizeAttributes(true)")
$htmlMin->doMinifyJavaScript();                       // minify inline JavaScript inside regular <script> tags (disabled by default)
$htmlMin->doRemoveDeprecatedTypeFromStylesheetLink(); // remove "type=text/css" for css links (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveDeprecatedTypeFromStyleAndLinkTag(); // remove "type=text/css" from all links and styles
$htmlMin->doRemoveDefaultMediaTypeFromStyleAndLinkTag(); // remove "media="all" from all links and styles
$htmlMin->doRemoveDefaultTypeFromButton();            // remove type="submit" from button tags 
$htmlMin->doRemoveEmptyAttributes();                  // remove some empty attributes (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveDataAttributes();                   // remove all "data-*" attributes (depends on "doOptimizeAttributes(true)" | disabled by default)
$htmlMin->doRemoveValueFromEmptyInput();              // remove 'value=""' from empty <input> (depends on "doOptimizeAttributes(true)")
$htmlMin->doSortCssClassNames();                      // sort css-class-names, for better gzip results (depends on "doOptimizeAttributes(true)")
$htmlMin->doSortHtmlAttributes();                     // sort html-attributes, for better gzip results (depends on "doOptimizeAttributes(true)")
$htmlMin->doRemoveSpacesBetweenTags();                // remove more (aggressive) spaces in the dom (disabled by default)
$htmlMin->doRemoveOmittedQuotes();                    // remove quotes e.g. class="lall" => class=lall
$htmlMin->doRemoveOmittedHtmlTags();                  // apply supported WHATWG optional tag omission rules e.g. <p>lall</p> => <p>lall
```

Current optional tag support from the WHATWG HTML syntax rules:

- `<html>`: start tag may be omitted when the first child is not a comment; end tag may be omitted when the element is not immediately followed by a comment.
- `<head>`: start tag may be omitted when the element is empty or starts with an element; end tag may be omitted when it is not immediately followed by ASCII whitespace or a comment.
- `<body>`: start tag may be omitted when the element is empty or starts with something other than ASCII whitespace / a comment / `meta` / `noscript` / `link` / `script` / `style` / `template`; end tag may be omitted when it is not immediately followed by a comment.
- `<p>`: end tag may be omitted before `address`, `article`, `aside`, `blockquote`, `details`, `dialog`, `div`, `dl`, `fieldset`, `figcaption`, `figure`, `footer`, `form`, `h1`-`h6`, `header`, `hgroup`, `hr`, `main`, `menu`, `nav`, `ol`, `p`, `pre`, `search`, `section`, `table`, or `ul`, or at the end of the parent when the parent is not `a`, `audio`, `del`, `ins`, `map`, `noscript`, `video`, or an autonomous custom element.
- `<li>`, `<dt>`, `<dd>`, `<rt>`, `<rp>`, `<tr>`, `<td>`, and `<th>`: the end tag may be omitted in the standard adjacent-sibling / end-of-parent cases from the spec.
- `<option>`: the end tag may be omitted before another `option`, `optgroup`, or `hr`, or at the end of the parent.
- `<optgroup>`: the end tag may be omitted before another `optgroup` or `hr`, or at the end of the parent.
- `<colgroup>`: the start tag may be omitted when the first child is `col` and the previous omitted-tag rule does not block it; the end tag may be omitted when it is not immediately followed by ASCII whitespace or a comment.
- `<caption>`: the end tag may be omitted when it is not immediately followed by ASCII whitespace or a comment.
- `<thead>`: the end tag may be omitted before `tbody` or `tfoot`.
- `<tbody>`: the start tag may be omitted when the first child is `tr` and the previous omitted-tag rule does not block it; the end tag may be omitted before `tbody` / `tfoot` or at the end of the parent.
- `<tfoot>`: the end tag may be omitted at the end of the parent.

Start tags are never omitted when the element has attributes.

PS: you can use the "nocompress"-tag to keep the html e.g.: "<nocompress>\n foobar \n</nocompress>"

### Unit Test

1) [Composer](https://getcomposer.org) is a prerequisite for running the tests.

```
composer require voku/html-min
```

2) The tests can be executed by running this command from the root directory:

```bash
./vendor/bin/phpunit
```

### Support

For support and donations please visit [Github](https://github.com/voku/HtmlMin/) | [Issues](https://github.com/voku/HtmlMin/issues) | [PayPal](https://paypal.me/moelleken) | [Patreon](https://www.patreon.com/voku).

For status updates and release announcements please visit [Releases](https://github.com/voku/HtmlMin/releases) | [Twitter](https://twitter.com/suckup_de) | [Patreon](https://www.patreon.com/voku/posts).

For professional support please contact [me](https://about.me/voku).

### Thanks

- Thanks to [GitHub](https://github.com) (Microsoft) for hosting the code and a good infrastructure including Issues-Managment, etc.
- Thanks to [IntelliJ](https://www.jetbrains.com) as they make the best IDEs for PHP and they gave me an open source license for PhpStorm!
- Thanks to [Travis CI](https://travis-ci.com/) for being the most awesome, easiest continous integration tool out there!
- Thanks to [StyleCI](https://styleci.io/) for the simple but powerful code style check.
- Thanks to [PHPStan](https://github.com/phpstan/phpstan) & [Psalm](https://github.com/vimeo/psalm) for really great Static analysis tools and for discovering bugs in the code!

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