Add image to product programmatically

function.php

<?php
// Add three image sizes to media gallery
$mediaArray = array(
    'thumbnail'   => $putPathHere,
    'small_image' => $putPathHere,
    'image'       => $putPathHere,
);

// Remove unset images, add image to gallery if exists
$importDir = Mage::getBaseDir('media') . DS . 'import/';

foreach($mediaArray as $imageType => $fileName) {
    $filePath = $importDir.$fileName;
    if ( file_exists($filePath) ) {
        try {
            $product->addImageToMediaGallery($filePath, $imageType, false);
        } catch (Exception $e) {
            echo $e->getMessage();
        }
    } else {
        echo "Product does not have an image or the path is incorrect. Path was: {$filePath}<br/>";
    }
}

image.php

<?php
require_once 'app/Mage.php';
Mage::app();
Mage::app()->getStore()->setId(Mage_Core_Model_App::ADMIN_STORE_ID);
$importDir = Mage::getBaseDir('media') . DS . 'bulkimages/101/';

$productsData = array('Purple-Crown-Ring-MFAS.jpg','Purple-Crown-Ring-MFC.jpg','Purple-Crown-Ring-MSAS.jpg','Purple-Crown-Ring-MSF.jpg');

$productSKU = '111';
$ourProduct = Mage::getModel('catalog/product')->loadByAttribute('sku',$productSKU);

foreach($productsData as $fileName){
    $filePath = $importDir.$fileName;
    if (file_exists($filePath)) {
        $ourProduct->addImageToMediaGallery($filePath, array('image', 'small_image', 'thumbnail'), false, false);
        $ourProduct->save();
        echo "done ";
    } else {
        echo $productSKU . " not done";
        echo "<br>";
    }   
}
?>