<?php

/* CSV file

"1001", "121212"
"1001", "12991"
"1042", "99878"
"1042", "89776"
"1042", "87777"
"1045", "11010"
"1046", "22299"
"1049", "9875"

*/

$filepath = 'myfile.csv';
$handle = fopen($filepath, "r");

$row = 0;

    while (($data = fgetcsv($handle, 1000, ",")) !== FALSE && $row < 8) {
        $sku = $data[0];
        $upc = $data[1];
        $skuUpcList = array($sku => array());
        array_push($skuUpcList[$sku], $upc);

        $row++;

        while(($data = fgetcsv($handle, 1000, ",")) !== FALSE && $row < 8) {
            if($data[0] == $sku) {
                array_push($skuUpcList[$sku], $data[1]);
                $row++;
            } else {
                $sku = $data[0];
                $upc = $data[1];
                $skuUpcList = array($sku => array());
                array_push($skuUpcList[$sku], $data[1]);
                $row++;
            }
            $skuUpcList = array_unique($skuUpcList);
            var_dump($skuUpcList);
            echo  '<br>';
        }


    }