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On my WordPress theme, it displays all of the categories a post is in on the homepage for the post block, I only want to display one category even if a post is under multiple categories.

i.e. Category One, Category Two, Category Three

I want it to be Category One...

This is the code that is in place at the moment:

<h2><?php the_category(', ') ?></h2>
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Here's snippet to display first category from post.

$category = get_the_category();

if ( $category[0] ) {
    echo '<h2><a href="' . get_category_link( $category[0]->term_id ) . '">' . $category[0]->cat_name . '</a></h2>';

Original idea of the code is from WordPress Codex

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When using this snippet of code, it doesn't simply any categories. It's simply blank. – user1086337 Feb 6 '12 at 9:26
Are using it inside the loop? Otherwise you need pass post ID into get_the_category() – Mamaduka Feb 6 '12 at 10:24
thanks a lote mate – Sagive SEO Mar 7 '12 at 8:58

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