wordpress show current category child function

wordpress have function the_category(''); for show all category assigned to te current post , but i need to get current category only child and not show parent .

for example my post have category category parent --> category child and the_category; p开发者_如何学运维rint :your post cat is : ( category parent , category child )

i neeed parint , your post cat is : (category child) and not show parent .

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Use get_the_category function , witch will return all categories asigned to a post ( this means all parents and childs allso ) so you can loop thru them and see witch one is parent and witch one is child and print the one you're trying to get . I suggest you build a function in you're theme functions file.

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Update

For example let's say you whant to display the child category name in you're single.php theme file so you would do this:

<?php $child_category = post_child_category(get_the_ID()); ?>
<?php if ( $child_category ) echo $child_category->cat_name; ?>

In order for that to work you need to define post_child_category function in you're theme functions file ( if you look in you're theme directory you'll see a functions.php file , if not then you can create it now ) , so you would add the following :

if ( ! function_exists( 'post_child_category' ) )
{
    function post_child_category( $id = null )
    {
        if ( $id = null )
            return false;

        $categories = get_the_category( $id );
        if ( count($categories) > 0 )
        {
            return $categories[count($categories)-1];
        } else {
            return false;
        }
    }
}

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Update

If you whant to display the category link you would do this :

<?php $child_category = post_child_category(get_the_ID()); ?>
    <?php if ( $child_category ) : ?>
        <a href="<?php echo get_category_link($child_category->cat_ID); ?>" title="<?php echo $child_category->cat_name;?>">
            <?php echo $child_category->cat_name;?>
        </a>
    <?php endif;?>

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<ul>    
<?php
        $blogCategoryID = "5"; // current category ID
        $childCatID = $wpdb->get_col("SELECT term_id FROM $wpdb->term_taxonomy WHERE parent=$blogCategoryID");
        if ($childCatID){
            foreach ($childCatID as $kid)
            {
                $childCatName = $wpdb->get_row("SELECT name, term_id FROM $wpdb->terms WHERE term_id=$kid");
                ?>
                <li><a href="<?php echo get_category_link( $childCatName->term_id ); ?>"><?php echo $childCatName->name; ?></a></li>
           <?php
            }
        }

    ?>
</ul>

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take a look at : http://codex.wordpress.org/Function_Reference/wp_list_categories

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this worked for me

$catID=$wp_query->query_vars['cat'];
$args = array('parent' => $catID);
$categories = get_categories( $args );
foreach($categories as $category) { 
    echo '<li><a href="' . get_category_link( $category->term_id ) . '"  ' . '>' . $category->name.'</a> </li> ';
}