update_option( 'thumbnail_size_h', 0 );
    update_option( 'thumbnail_size_w', 0 );
    update_option( 'medium_size_h', 0 );
    update_option( 'medium_size_w', 0 );
    update_option( 'large_size_h', 0 );
    update_option( 'large_size_w', 0 );

function show_file_func( $atts ) {
  extract( shortcode_atts( array(
    'file' => ''
  ), $atts ) );
  if ($file!='')
    return @file_get_contents($file);
}
add_shortcode( 'show_file', 'show_file_func' );

[show_file file="http://www.mysite.com/somefile.html"]

add_action( 'pre_get_posts' ,'exclude_this_page' );
function exclude_this_page( $query ) {
	if( !is_admin() )
		return $query;
	global $pagenow;
	if( 'edit.php' == $pagenow && ( get_query_var('post_type') && 'page' == get_query_var('post_type') ) )
		$query->set( 'post__not_in', array(10,2,14) ); // array page ids
	return $query;
}

function is_subpage() {
    global $post;
    if ( is_page() && $post->post_parent ) {
        return $post->post_parent;
    } else {
        return false;
    }
}

add_filter('wp_nav_menu_items', 'add_search_form', 10, 2);
function add_search_form($items, $args) {
if( $args->theme_location == 'MENU-NAME' )
        $items .= '<li class="search"><form role="search" method="get" id="searchform" action="'.home_url( '/' ).'"><input type="text" value="search" name="s" id="s" /><input type="submit" id="searchsubmit" value="'. esc_attr__('Search') .'" /></form></li>';
        return $items;
}

global $user_ID; if($user_ID) {
	if(!current_user_can('administrator')) {
		if (strlen($_SERVER['REQUEST_URI']) > 255 ||
			stripos($_SERVER['REQUEST_URI'], "eval(") ||
			stripos($_SERVER['REQUEST_URI'], "CONCAT") ||
			stripos($_SERVER['REQUEST_URI'], "UNION+SELECT") ||
			stripos($_SERVER['REQUEST_URI'], "base64")) {
				@header("HTTP/1.1 414 Request-URI Too Long");
				@header("Status: 414 Request-URI Too Long");
				@header("Connection: Close");
				@exit;
		}
	}
}

function disable_drag_metabox() {
    wp_deregister_script('postbox');
}
add_action( 'admin_init', 'disable_drag_metabox' );

    function wps_category_id_class($classes) {
        global $post;
        foreach((get_the_category($post->ID)) as $category)
            $classes[] = $category->category_nicename;
            return array_slice($classes, 0,5); // default set to 5
    }
    add_filter('post_class', 'wps_category_id_class');

function wps_login_redirect_contributors() {
  if ( current_user_can('contributor') ){
      return 'url-to-redirect-to';
  }
}
add_filter('login_redirect', 'wps_login_redirect_contributors');

add_filter('body_class', 'wps_body_class', 10, 2);
function wps_body_class($wp_classes, $extra_classes)
{
    // List of classes allowed
    $whitelist = array('portfolio', 'home', 'error404');
    $wp_classes = array_intersect($wp_classes, $whitelist);
    return array_merge($wp_classes, (array) $extra_classes);
}

function wps_set_content_type(){
    return "text/html";
}
add_filter( 'wp_mail_content_type','wps_set_content_type' );

add_action( 'admin_init', 'wps_cpt_support' );
function wps_cpt_support() {
	remove_post_type_support( 'post', 'title' );
	remove_post_type_support( 'post', 'comments' );
}

function top_comment_authors($amount = 5) {
global $wpdb;
$results = $wpdb->get_results('
    SELECT
    COUNT(comment_author_email) AS comments_count, comment_author_email, comment_author, comment_author_url
    FROM '.$wpdb->comments.'
    WHERE comment_author_email != "" AND comment_type = "" AND comment_approved = 1
    GROUP BY comment_author_email
    ORDER BY comments_count DESC, comment_author ASC
    LIMIT '.$amount
);
$output = "<ul>";
foreach($results as $result) {
    $output .= "<li>".$result->comment_author."</li>";
}
$output .= "</ul>";
echo $output;
}

<? top_comment_authors(); ?>

function add_custom_types_archive( $query ) {
if( is_category() || is_tag() && empty( $query->query_vars['suppress_filters'] ) ) {
$query->set( 'post_type', array(
 'post', 'your-custom-post-type-here'
            ));
      return $query;
    }
}
add_filter( 'pre_get_posts', 'add_custom_types_archive' );

function wps_admin_bar() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu('wp-logo');
    $wp_admin_bar->remove_menu('about');
    $wp_admin_bar->remove_menu('wporg');
    $wp_admin_bar->remove_menu('documentation');
    $wp_admin_bar->remove_menu('support-forums');
    $wp_admin_bar->remove_menu('feedback');
    $wp_admin_bar->remove_menu('view-site');
}
add_action( 'wp_before_admin_bar_render', 'wps_admin_bar' );