How do I validate my fields from metaboxes

  • Hi o/
    I want to stop the user from save a post and show him an error message saying that something is wrong. There’s a hook for this?

    function my_custom_metabox(){
        echo '<input name="occupation" ....';
    }
    function save_metabox_field(){
        global $post;
        if(isset($_POST['occupation'])){
             update_post_meta($post->ID, 'occupation', $_POST['occupation']);
        }
    }

    How do I check if $_POST[‘occupation’] is not empty (just for example)?
    OBS: I hide the add_actions for simplify the code

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