如何在get_cat_id上给出isset（$ up_options-> category1）

Question

I have a code like this (call a category defined from theme panel):

 <?php query_posts ('ignore_sticky_posts=1&showposts=1&cat='.get_cat_id
 ($up_options->category1)
 ); 

Everything work fine but need to add isset in case the category did not define.

I give isset like this:

 <?php query_posts ('ignore_sticky_posts=1&showposts=1&cat='.get_cat_id(
 (isset($up_options->category1) && $up_options->category1))
 );

But did not work. Can anyone help me? I'm pretty new to PHP.

Thank for any kind of helps.

Here the full code:

 <div class="wrapper">
    <?php query_posts ('ignore_sticky_posts=1&showposts=1&cat='.get_cat_id($up_options->category1));    
     if (have_posts()) :
         while (have_posts()) : the_post();?>
    <div class="inside">
        <div class="title">
            <h5> <a href="<?php the_permalink() ?>" title="<?php  the_title(); ?>"><?php echo substr(the_title('', '', false), 0, 75); ?>...</a> </h5>
        </div>
    </div>
 <?php endwhile; endif; wp_reset_query();?>
 </div>

Answer 1

Try like this:

$cat_id = get_cat_ID($up_options->category1);

if($cat_id != null){
    query_posts('ignore_sticky_posts=1&showposts=1&cat='.$cat_id);
} else {
    echo 'Category not defined';
}

Update

Here is working solution according to updated question:

<?php 
    global $up_options;
    $cat_id = get_cat_ID($up_options->category1);

    if($cat_id != null) :
        query_posts ('ignore_sticky_posts=1&showposts=1&cat='.$cat_id);    
         if (have_posts()) :
             while (have_posts()) : the_post();?>
        <div class="inside">
            <div class="title">
                <h5>
                    <a href="<?php the_permalink() ?>" title="<?php  the_title(); ?>"><?php echo substr(the_title('', '', false), 0, 75); ?>...</a>
                </h5>
            </div>
        </div>
     <?php endwhile; endif; wp_reset_query(); endif;?>