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msd2/wordpress/wp-content/plugins/wordpress-seo/frontend/class-handle-404.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Frontend
+ */
+
+/**
+ * Class WPSEO_Handle_404
+ *
+ * Handles intercepting requests.
+ *
+ * @since 9.4
+ */
+class WPSEO_Handle_404 implements WPSEO_WordPress_Integration {
+
+	/**
+	 * Registers all hooks to WordPress.
+	 *
+	 * @return void
+	 */
+	public function register_hooks() {
+		add_filter( 'pre_handle_404', array( $this, 'handle_404' ) );
+	}
+
+	/**
+	 * Handle the 404 status code.
+	 *
+	 * @param bool $handled Whether we've handled the request.
+	 *
+	 * @return bool True if it's 404.
+	 */
+	public function handle_404( $handled ) {
+
+		if ( is_feed() ) {
+			return $this->is_feed_404( $handled );
+		}
+
+		return $handled;
+	}
+
+	/**
+	 * If there are no posts in a feed, make it 404 instead of sending an empty RSS feed.
+	 *
+	 * @global WP_Query $wp_query
+	 *
+	 * @param bool $handled Whether we've handled the request.
+	 *
+	 * @return bool True if it's 404.
+	 */
+	protected function is_feed_404( $handled ) {
+		global $wp_query;
+
+		// Don't 404 if the query contains post(s) or an object.
+		if ( $wp_query->posts || $wp_query->get_queried_object() ) {
+			return $handled;
+		}
+
+		// Don't 404 if it isn't archive or singular.
+		if ( ! $wp_query->is_archive() && ! $wp_query->is_singular() ) {
+			return $handled;
+		}
+
+		$wp_query->is_feed = false;
+		$this->set_404();
+
+		add_filter( 'old_slug_redirect_url', '__return_false' );
+		add_filter( 'redirect_canonical', '__return_false' );
+
+		return true;
+	}
+
+	/**
+	 * Sets the 404 status code.
+	 *
+	 * @global WP_Query $wp_query
+	 *
+	 * @return void
+	 */
+	private function set_404() {
+		global $wp_query;
+
+		// Overwrite Content-Type header.
+		if ( ! headers_sent() ) {
+			header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) );
+		}
+
+		$wp_query->set_404();
+		status_header( 404 );
+		nocache_headers();
+	}
+}