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Editing: class-extensions.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin
 */

/**
 * Represents the class that contains the list of possible extensions for Yoast SEO.
 */
class WPSEO_Extensions {

/**
	 * Array with the Yoast extensions.
	 *
	 * @var array
	 */
	protected $extensions = [
		'Yoast SEO Premium' => [
			'slug'          => 'yoast-seo-premium',
			'identifier'    => 'wordpress-seo-premium',
			'classname'     => 'WPSEO_Premium',
			'my-yoast-slug' => WPSEO_Addon_Manager::PREMIUM_SLUG,
		],
		'News SEO' => [
			'slug'          => 'news-seo',
			'identifier'    => 'wpseo-news',
			'classname'     => 'WPSEO_News',
			'my-yoast-slug' => WPSEO_Addon_Manager::NEWS_SLUG,
		],
		'Yoast WooCommerce SEO' => [
			'slug'          => 'woocommerce-yoast-seo',
			'identifier'    => 'wpseo-woocommerce',
			'classname'     => 'Yoast_WooCommerce_SEO',
			'my-yoast-slug' => WPSEO_Addon_Manager::WOOCOMMERCE_SLUG,
		],
		'Video SEO' => [
			'slug'          => 'video-seo-for-wordpress',
			'identifier'    => 'wpseo-video',
			'classname'     => 'WPSEO_Video_Sitemap',
			'my-yoast-slug' => WPSEO_Addon_Manager::VIDEO_SLUG,
		],
		'Local SEO' => [
			'slug'          => 'local-seo-for-wordpress',
			'identifier'    => 'wpseo-local',
			'classname'     => 'WPSEO_Local_Core',
			'my-yoast-slug' => WPSEO_Addon_Manager::LOCAL_SLUG,
		],
	];

/**
	 * Returns the set extensions.
	 *
	 * @return array All the extension names.
	 */
	public function get() {
		return array_keys( $this->extensions );
	}

/**
	 * Checks if the extension is valid.
	 *
	 * @param string $extension The extension to get the name for.
	 *
	 * @return bool Returns true when valid.
	 */
	public function is_valid( $extension ) {
		$addon_manager = new WPSEO_Addon_Manager();
		return $addon_manager->has_valid_subscription( $this->extensions[ $extension ]['my-yoast-slug'] );
	}

/**
	 * Invalidates the extension by removing its option.
	 *
	 * @param string $extension The extension to invalidate.
	 */
	public function invalidate( $extension ) {
		/*
		 * Make sure we clear the current site and multisite options.
		 *
		 * Because plugins can be site-activated or multi-site activated we need to clear
		 * all possible options.
		 *
		 * If we knew here that the extension in question was network activated
		 * we could do this a lot more easily.
		 */
		delete_option( $this->get_option_name( $extension ) );
		delete_site_option( $this->get_option_name( $extension ) );
	}

/**
	 * Checks if the plugin has been installed.
	 *
	 * @param string $extension The name of the plugin to check.
	 *
	 * @return bool Returns true when installed.
	 */
	public function is_installed( $extension ) {
		return class_exists( $this->extensions[ $extension ]['classname'] );
	}

/**
	 * Converts the extension to the required option name.
	 *
	 * @param string $extension The extension name to convert.
	 *
	 * @return string Returns the option name.
	 */
	protected function get_option_name( $extension ) {
		return sanitize_title_with_dashes( $this->extensions[ $extension ]['slug'] . '_', null, 'save' ) . 'license';
	}
}

Editing: class-extensions.php

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