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<?php
namespace Yoast\WP\SEO\Helpers\Twitter;
use Yoast\WP\SEO\Helpers\Image_Helper as Base_Image_Helper;
/**
* A helper object for Twitter images.
*/
class Image_Helper {
/**
* The base image helper.
*
* @var Base_Image_Helper
*/
private $image;
/**
* Image_Helper constructor.
*
* @codeCoverageIgnore
*
* @param Base_Image_Helper $image The image helper.
*/
public function __construct( Base_Image_Helper $image ) {
$this->image = $image;
}
/**
* The image size to use for Twitter.
*
* @return string Image size string.
*/
public function get_image_size() {
/**
* Filter: 'wpseo_twitter_image_size' - Allow changing the Twitter Card image size.
*
* @param string $featured_img Image size string.
*/
return (string) \apply_filters( 'wpseo_twitter_image_size', 'full' );
}
/**
* Retrieves an image url by its id.
*
* @param int $image_id The image id.
*
* @return string The image url. Empty string if the attachment is not valid.
*/
public function get_by_id( $image_id ) {
if ( ! $this->image->is_valid_attachment( $image_id ) ) {
return '';
}
return $this->image->get_attachment_image_source( $image_id, $this->get_image_size() );
}
}