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<?php namespace Yoast\WP\SEO\Presenters; use Yoast\WP\SEO\Presentations\Indexable_Presentation; /** * Presenter class for the canonical. */ class Canonical_Presenter extends Abstract_Indexable_Tag_Presenter { /** * The tag key name. * * @var string */ protected $key = 'canonical'; /** * The tag format including placeholders. * * @var string */ protected $tag_format = self::LINK_REL_HREF; /** * The method of escaping to use. * * @var string */ protected $escaping = 'url'; /** * Run the canonical content through the `wpseo_canonical` filter. * * @return string The filtered canonical. */ public function get() { if ( \in_array( 'noindex', $this->presentation->robots, true ) ) { return ''; } /** * Filter: 'wpseo_canonical' - Allow filtering of the canonical URL put out by Yoast SEO. * * @param string $canonical The canonical URL. * @param Indexable_Presentation $presentation The presentation of an indexable. */ return \urldecode( (string) \trim( \apply_filters( 'wpseo_canonical', $this->presentation->canonical, $this->presentation ) ) ); } }