WordPress/wp-admin/edit-form-ajax-cat.php

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<?php
require_once('../wp-config.php');
require_once('admin-functions.php');
get_currentuserinfo();
if ( !current_user_can('manage_categories') )
die('-1');
function get_out_now() { exit; }
add_action('shutdown', 'get_out_now', -1);
$cat_name = rawurldecode($_GET['ajaxnewcat']);
if ( !$category_nicename = sanitize_title($cat_name) )
die('0');
if ( $already = category_exists($cat_name) )
die((string) $already);
$new_cat_id = wp_create_category($cat_name);
die((string) $new_cat_id);
?>