Merged in feature/MAW-855-import-code-into-aws (pull request #2)

code import from pantheon

* code import from pantheon

wp/wp-content/plugins/wordpress-seo/src/introductions/application/current-page-trait.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Yoast\WP\SEO\Introductions\Application;
+
+trait Current_Page_Trait {
+
+	/**
+	 * Determines whether the current page is applicable.
+	 *
+	 * @param string[] $pages The applicable pages.
+	 *
+	 * @return bool Whether the current page is applicable.
+	 */
+	private function is_on_yoast_page( $pages ) {
+		return \in_array( $this->get_page(), $pages, true );
+	}
+
+	/**
+	 * Determines whether the current page is one of our installation pages.
+	 *
+	 * @return bool Whether the current page is one of our installation pages.
+	 */
+	private function is_on_installation_page() {
+		return $this->is_on_yoast_page( [ 'wpseo_installation_successful_free', 'wpseo_installation_successful' ] );
+	}
+
+	/**
+	 * Retrieve the page variable.
+	 *
+	 * Note: the result is not safe to use in anything than strict comparisons!
+	 *
+	 * @return string The page variable.
+	 */
+	private function get_page() {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Reason: We are not processing form information.
+		if ( isset( $_GET['page'] ) && \is_string( $_GET['page'] ) ) {
+			// phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Reason: We are not processing form information, only using it in strict comparison.
+			return \wp_unslash( $_GET['page'] );
+		}
+
+		return '';
+	}
+}