How to intercept a 404 error

I’d like to intercept 404 errors and do some things before to show the 404 error page.

How can intercept the 404 error?

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Answers:

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Method 1

As was mentioned in a comment, template_redirect would be an appropriate hook for intercepting a 404 before the template is loaded.

function wpd_do_stuff_on_404(){
    if( is_404() ){
        // do stuff
    }
}
add_action( 'template_redirect', 'wpd_do_stuff_on_404' );

Refer to the Action Reference for the general order of actions on the front end. The main query runs between the posts_selection and wp actions, so that is the earliest you can determine that a request is a 404. The template is then loaded after template_redirect, so it’s too late to set headers after that point.

Method 2

Using below code you can directly redirect on home page when 404 call, please remove all code from the 404.php file and add below code.

<?php
header("HTTP/1.1 301 Moved Permanently");
header("Location: ".get_bloginfo('url'));
exit();
?>

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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