Widget for simple generating OpenGraph meta tags and Schema.org markdown for images ('X' stands for 'eXtended').

You may do absolutely nothing - OpenGraph meta tags and Schema.org markdown will be generated 'on-the-fly' from image properties (which you can still define like you do in Html::img()).

You should generally follow Yii 2 requirements. The minimum is that your Web server supports PHP 5.4.0.

If you do not have Composer, you may install it by following the instructions at getcomposer.org.

Either run

php composer.phar require --prefer-dist zyx/widget-imagex "*"

or add

"zyx/widget-imagex": "*"

to the require section of your composer.json.

Just add following string to your layout

use zyx\widgets\ImageX;

And call widget where the image is supposed to be instead of usual Html::img():

echo ImageX::widget([
                  'src' => 'http://static.yiiframework.com/css/img/logo.png',
                  'options' => ['width' => 280, 'height' => 60],
                  'og' => [],
                  'md' => ['div_class' => 'image_wrap']
                ]);

Note: only 'src' parameter is mandatory. Array of 'options' is the same you use for image options in Html::img(). If both 'og' (OpenGraph) and 'md' (schema.org) configuration arrays are empty - you may not declare them at all. You can to disable one of them (they are both enabled by default) - e.g. 'md' => ['enable' => false].

In the HEAD:

...
  <meta property="og:image" content="http://static.yiiframework.com/css/img/logo.png">
  <meta property="og:image:type" content="image/png">
  <meta property="og:image:width" content="280">
  <meta property="og:image:height" content="60">
...

In the BODY ('img' is wrapped in 'div' tag):

...
<div itemscope itemtype="http://schema.org/ImageObject" class="image_wrap">
  <img src="http://static.yiiframework.com/css/img/logo.png" width="280" height="60" alt="" itemprop="contentUrl" />
	<meta itemprop="width" content="280" />
	<meta itemprop="height" content="60" />
</div>
...

Properties like 'width' and 'height' set explicitly in 'og' and 'md' configuration arrays, passed to widget, have priority. If no such options were set, widget attempts to extract properties from image 'options' array.

So you can just call:

echo ImageX::widget([
                  'src' => 'http://static.yiiframework.com/css/img/logo.png',
                  'options' => ['width' => 280, 'height' => 60]
                ]);

like you called Html::img() with no additional options.