WordPress Function to Automatically add a hidden custom field and associating value to a post when the post is published

Automatically add a hidden custom field and associating value to a post when the post is published

add_action('publish_page', 'add_custom_field_automatically');
add_action('publish_post', 'add_custom_field_automatically');
function add_custom_field_automatically($post_ID) {
global $wpdb;
if(!wp_is_post_revision($post_ID)) {
    add_post_meta($post_ID, 'field-name', 'custom value', true);
}
}

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