Add custom attribute to image using the_post_thumbnail

Sometimes you will need to add a custom attribute to an image. This is very easy to do using the_post_thumbnail() function. The following snippet will add the custom attribute of 'itemprop'="image" to your images, but you can change that to nearly anything, including class, alt, title, etc.

the_post_thumbnail( 'thumbnail', array('itemprop'=>'image') );

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