is_404()

Is the query a 404 (returns no results)?

Return

(bool)

Source

File: wp-includes/query.php 

function is_404() {
	global $wp_query;

	if ( ! isset( $wp_query ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), 'WP-3.1.0' );
		return false;
	}

	return $wp_query->is_404();
}

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Related

Uses

Uses
Uses Description
wp-includes/l10n.php: __()

Retrieve the translation of $text.
wp-includes/class-wp-query.php: WP_Query::is_404()

Is the query a 404 (returns no results)?
wp-includes/functions.php: _doing_it_wrong()

Mark something as being incorrectly called.

Used By

Used By
Used By Description
wp-includes/general-template.php: wp_title()

Display or retrieve page title for all areas of blog.
wp-includes/general-template.php: wp_get_document_title()

Returns document title for the current page.
wp-includes/query.php: wp_old_slug_redirect()

Redirect old slugs to the correct permalink.
wp-includes/embed.php: print_embed_comments_button()

Prints the necessary markup for the embed comments button.
wp-includes/embed.php: print_embed_sharing_button()

Prints the necessary markup for the embed sharing button.
wp-includes/embed.php: print_embed_sharing_dialog()

Prints the necessary markup for the embed sharing dialog.
wp-includes/post-template.php: get_body_class()

Retrieve the classes for the body element as an array.
wp-includes/canonical.php: redirect_canonical()

Redirects incoming links to the proper URL based on the site url.
wp-includes/canonical.php: wp_redirect_admin_locations()

Redirects a variety of shorthand URLs to the admin.
wp-includes/class-wp.php: WP::handle_404()

Set the Headers for 404, if nothing is found for requested URL.
wp-includes/ms-functions.php: maybe_redirect_404()

Correct 404 redirects when NOBLOGREDIRECT is defined.
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Changelog

Changelog
Version Description
WP-1.5.0 Introduced.