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<?php
function category_exists($cat_name, $parent = 0) {
    $id = term_exists($cat_name, 'category', $parent);
    if ( is_array($id) )
        $id = $id['term_id'];
    return $id;
}
?>

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• #2652 (category_exists() checks using slug) – WordPress Trac
  Okay, maybe I'm missing something, but I noticed when you give category_exists( ) a category name, it creates a sanitized version of that name (i.e. what it's slug ...
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• category_exists (WordPress Function) - WPSeek.com
  WordPress lookup for category_exists, a WordPress Function. wpseek.com is a WordPress-centric search tool for developers and theme authors.
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• category_exists() WordPress function reference, arguments and ...
  Search. Blog. category_exists(). Signature. category_exists( $cat_name, $parent = 0 ). cat_name: (unknown_type); parent: Default: 0. Return. (unknown). Source ...
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