February 12, 2011 
Definition:
function wp_update_category($catarr) {}
Aliases wp_insert_category() with minimal args.
If you want to update only some fields of an existing category, call this function with only the new values set inside $catarr.
Parameters
- array $catarr: The ‘cat_ID’ value is required. All other keys are optional.
Return values
returns:The ID number of the new or updated Category on success. Zero or FALSE on failure.
Source code
function wp_update_category($catarr) {
$cat_ID = (int) $catarr['cat_ID'];
if ( isset($catarr['category_parent']) && ($cat_ID == $catarr['category_parent']) )
return false;
// First, get all of the original fields
$category = get_category($cat_ID, ARRAY_A);
// Escape data pulled from DB.
$category = add_magic_quotes($category);
// Merge old and new fields with new fields overwriting old ones.
$catarr = array_merge($category, $catarr);
return wp_insert_category($catarr);
}
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