February 12, 2011 
Definition:
function wp_delete_category($cat_ID) {}
Deletes one existing category.
Parameters
- int $cat_ID
Return values
returns:Returns true if completes delete action; false if term doesnt exist; Zero on attempted deletion of default Category; WP_Error object is also a possibility.
Source code
function wp_delete_category($cat_ID) {
$cat_ID = (int) $cat_ID;
$default = get_option('default_category');
// Don't delete the default cat
if ( $cat_ID == $default )
return 0;
return wp_delete_term($cat_ID, 'category', array('default' => $default));
}
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A HitchHackers guide through WordPress 
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