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msd2/wordpress/wp-content/plugins/wordpress-seo/inc/class-wpseo-features.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\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();
+	}
+}