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EDIT :: class-wpseo-features.php

<?php /** * @package WPSEO * @subpackage Internal */ /** * Class containing method for WPSEO Features. */ class WPSEO_Features { /** * Checks if the premium constant exists to make sure if plugin is the premium one. * * @return bool */ public function is_premium() { return ( defined( 'WPSEO_PREMIUM_FILE' ) ); } /** * Checks if using the free version of the plugin. * * @return bool */ public function is_free() { return ! $this->is_premium(); } }

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