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<?php

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namespace Yoast\WP\SEO\Helpers\Twitter;

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use Yoast\WP\SEO\Helpers\Image_Helper as Base_Image_Helper;

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/**

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* A helper object for Twitter images.

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class Image_Helper {

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/**

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* The base image helper.

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* @var Base_Image_Helper

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private $image;

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/**

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* Image_Helper constructor.

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* @codeCoverageIgnore

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* @param Base_Image_Helper $image The image helper.

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public function __construct( Base_Image_Helper $image ) {

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$this->image = $image;

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}

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/**

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* The image size to use for Twitter.

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* @return string Image size string.

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public function get_image_size() {

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/**

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* Filter: 'wpseo_twitter_image_size' - Allow changing the Twitter Card image size.

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* @param string $featured_img Image size string.

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return (string) \apply_filters( 'wpseo_twitter_image_size', 'full' );

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}

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/**

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* Retrieves an image url by its id.

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* @param int $image_id The image id.

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* @return string The image url. Empty string if the attachment is not valid.

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public function get_by_id( $image_id ) {

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if ( ! $this->image->is_valid_attachment( $image_id ) ) {

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return '';

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}

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return $this->image->get_attachment_image_source( $image_id, $this->get_image_size() );

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}

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}

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