How to override wp-login.php in WordPress

I would like to override the default WordPress Login page: wp-login.php.

The reason is that, I want to write some custom code at the top of the file, that checks some conditions in the backend, and performs stuff like redirecting the user to some other page.

I would like to do this because I want to perform my own authentication logic in a custom file, without showing the default WordPress login form. My logic includes parsing of some cookie and session data (no login form in particular, may be a custom form).

I actually thought of writing my logic in the header.php file of a child theme, but unfortunately the wp-login.php file does not include the theme’s header file.

I don’t want to edit the wp-login.php directly as I’am worried all my modifications will be lost with any future WordPress update.

Is there a way I can safely override the WordPress login page without incurring any loss after any WordPress update?

Or is it possible to route all requests to wp-login.php, to a custom PHP file, so that I can write all my logic in that file?

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1 comment

Don’t modify core, use the actions and hooks system instead

add_action( 'login_init', 'yourloginoverrides' );

function yourloginoverrides() {
    // do some check and call wp_redirect if its true or whatever you wanted to do
}

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