explian the filters

  • in function-post.php there is this line:

    $post_category = apply_filters('category_save_pre', $post_category);

    I’ve searched for a filters ‘category_save_pre’ but there isn’t any functions…

    i’ve tried to use this but it doesn’t work:

    $post_url = $_POST['post_url'] ;
    $post_url = apply_filters('clean_url', $post_url);

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