do_action_ref_array( ‘set_404’, WP_Query $query )

Fires after a 404 is triggered.

Parameters

do_action_ref_array( 'set_404', array( $this ) );

Used by	Description
WP_Query::set_404()`wp-includes/class-wp-query.php`	Sets the 404 property and saves whether query is feed.

Version	Description
5.5.0	Introduced.

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