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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();
}
}
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