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I am trying to implement a slider on my site but i cannot find out how to display the category for each post displayed. I want it to display over the thumbnail. is there a code i can enter to display category?

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A post can have multiple categories assigned to it. Are you working within the WordPress Loop? Perhaps, just a few more details on where you are having troubles would help to answer your question. – Brent Sep 7 '12 at 4:37
What have you tried already? Show us your code. And welcome to WordPress Stack Exchange! – toscho Sep 7 '12 at 5:01

To get the current category of the post

just try this

$cats = get_the_category( get_the_ID() );

echo $cat_name = $cats[0]->name;
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Thanks this worked! – icanhazgiraffe Sep 26 '13 at 20:19
@icanhazgiraffe please accept this answer. If you said this solution worked for you, mark it as such. – Pieter Goosen Apr 2 '14 at 6:18
function get_post_category($postId) {
    global $wpdb;
    if (!is_null($postId)) {
        $conditions = "AND p.id=" . $postId;
    } else {
        return false;
    $conditions .= " AND ttax.taxonomy='category'";
    $selectfields = "term.name name";
    $query = "SELECT " . $selectfields . "
                    FROM   wp_posts p 
                    INNER JOIN wp_term_relationships trel ON trel.object_id = p.id 
                    INNER JOIN wp_term_taxonomy ttax ON ttax.term_taxonomy_id = trel.term_taxonomy_id 
                    INNER JOIN  wp_terms term ON term.term_id = ttax.term_id  
                    WHERE 1=1 " . $conditions ." LIMIT 1";
    return $wpdb->get_results($query);

This function needs the post id as parameter and it will give you the top most category of the post, if you remove LIMIT, it will give you a list of all categories of the post. I am not sure whether you want achieve the same or not.

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not sure you really need to drop down to SQL for this - what's wrong with using get_the_category() or similar? – anu Oct 6 '12 at 9:51

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