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Keep Custom Field Changes in Revisions

Saves chosen custom fields, such as a subtitle, price or event date, with every revision so restoring an older version brings those values back too.

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Code

// Custom field keys to store with revisions.
$wpide_revision_meta_keys = array( 'subtitle', 'price', 'event_date' );

add_filter( 'wp_post_revision_meta_keys', function ( $keys ) use ( $wpide_revision_meta_keys ) {
    return array_values( array_unique( array_merge( $keys, $wpide_revision_meta_keys ) ) );
} );

Notes

Needs WordPress 6.4 or newer; list the field keys in $wpide_revision_meta_keys.

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