Magento - Assign Related Products programmatically using CSV file

Example CSV :

SKU,Related SKUs
HG1126879,"HG1235845, HG1235852, hello123"
HG1201847,"HG1201862, HG1201771"

<?php
set_time_limit(0);
ini_set('memory_limit','1024M');

require_once('app/Mage.php');
Mage::app();

//echo '<pre>';

$csvpath = getcwd().'/related.csv';
$row = 1;

if(($handle = fopen($csvpath, "r")) !== FALSE)
{
    while($data = fgetcsv($handle,0,","))
    {
        if($row!=1)
        {
            //print_r($data);
            $sku = $data[0];
            $product = Mage::getModel('catalog/product')->loadByAttribute('sku',$sku);

            if($product)
            {
                $sRelatedProducts = $data[1];
                $aRelatedProducts = explode(',', $sRelatedProducts);

                $aParams = array();
                $nRelatedCounter = 1;

                foreach($aRelatedProducts as $sSku)
                {
                    $aRelatedProduct = Mage::getModel('catalog/product')->loadByAttribute('sku', trim($sSku));

                    if($aRelatedProduct)
                    {
                        $aParams[$aRelatedProduct['entity_id']] = array('position' => $nRelatedCounter);
                        $nRelatedCounter++;
                    }
                    else
                    {
                        $msg = "CSV Row - $row : Related Product with SKU ".trim($sSku)." not found";
                        Mage::log($msg, null, 'add_related.log');
                    }
                }

                //print_r($aParams);

                $product->setRelatedLinkData($aParams);
                $product->save();
            }
            else
            {
                $msg = "CSV Row - $row : Product with SKU $sku not found";
                Mage::log($msg, null, 'add_related.log');
            }
        }
        $row++;
    }

    echo "Add Related Products script executed successfully.";
    echo "<br/><br/>CSV has Records : ".($row-2);
}