Magento - remove broken images

gistfile1.php

<?php

include_once("app/Mage.php");

umask(0);

Mage::app('admin');

$collection = Mage::getResourceModel('catalog/product_collection');

foreach ($collection as $product){

    $mediaApi = Mage::getModel("catalog/product_attribute_media_api");

    $items = $mediaApi->items($product->getId());

    foreach($items as $item){

        $image_url = Mage::getBaseDir('media').'/catalog/product'.$item['file'];

        if(!file_exists($image_url)){

            $mediaApi->remove($product->getId(), $item['file']);

        }

    }

}