Wordpress - Function to wrap all images and adds Pinterest button

wrapper_image.php

// Wordpress - Function to wrap all images and adds Pinterest button
// Add Pinterest Button to all Images in the_content()
// Wraps image with container and add link to share src from all <img> in the content
function gear_pinterest_in_content_images($content) {

	$dom = new DOMDocument('UTF-8');
	@$dom->loadHTML( utf8_decode($content) ); // Decode to simple ISO to avoid accent errors
	$dom->preserveWhiteSpace = false;
	$images = $dom->getElementsByTagName('img');

	if( count($images) > 0 ) {
		foreach ($images as $image) {
			// get the widths of each image
			$width = $image->getAttribute('width');

		    // if image is less than 860, add their old classes back in plus our new class
			if( $width >= 860) {

				$clone_img = $image->cloneNode(); //Clonamos el nodo de la imagen

				// Build Pinterest URL format
				$pin_url = sprintf('http://pinterest.com/pin/create/button/?url=%s&media=%s&description=%s',
					urlencode(get_permalink()),
					$image->getAttribute('src'),
					urlencode(get_bloginfo('name').' - '.get_the_title())
					);

				// Create DIV container
				$pin_wrap =  $dom->createElement('div');
				$pin_wrap->setAttribute('class', 'pinterest-button' );
				
				// Create link to share with no content and attributes
				$pin_link =  $dom->createElement('a',' ');
				$pin_link->setAttribute('class', 'share-pinterest icon-pinterest' );
				$pin_link->setAttribute('title', __('Compartir en Pinterest','tindas') );
				$pin_link->setAttribute('href', $pin_url );

				// Add to image to new container
				$pin_wrap->appendChild( $clone_img );

				// Add Pinterest link to container
				$pin_wrap->appendChild( $pin_link );

				// Replace img object with all new elements
				$image->parentNode->replaceChild( $pin_wrap, $image );	    	
			}
		} // end if count

		$content = $dom->saveHTML();
	}
	return $content;
}
add_filter( 'the_content' , 'gear_pinterest_in_content_images' , 15 );