Magento : How to delete all images which are not exists in the directory

Here is a simple code for those who want to delete all images from the product for which images are not exists in the media/catalog/product folder

[php]
<pre><em id="__mceDel">
ini_set('memory_limit', '-1');
set_time_limit(0);
require_once ('app/Mage.php');
Mage::app('default');

$imgfolder = 'media/catalog/product';
$collection = Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('*');

&nbsp;

foreach ($collection as $product) {
$img = $product->getImage();
if(!file_exists($imgfolder.$img)){
$products = Mage::getModel('catalog/product')->load($product->getId());
$entityTypeId = $products->getEntityTypeId();
$mediaGalleryAttribute = Mage::getModel('catalog/resource_eav_attribute')->loadByCode($entityTypeId, 'media_gallery');
$gallery = $products->getMediaGalleryImages();
foreach ($gallery as $image)
$mediaGalleryAttribute->getBackend()->removeImage($products, $image->getFile());
$products->save();
}

}

[/php]

Explanation of code :

1) ini_set('memory_limit', '-1');

There could be thousand of products that we can not load them in one shot.

2) set_time_limit(0);
Setting script execution time limit to no-limit as it could stop in between