create csv from array in php

<?php

$myarray = array(
                           array(
                                     ['sku'] =>'asdfa'
                             )
                           array(
                                 array(['sku'] =>'asdfa'
                           )
                    );

like this array

$productArray = array();
$productArray[0]['code'] = "Code";
$productArray[0]['name'] = "name";
$productArray[0]['product_group_description'] = "Product Group Description";
$productArray[0]['actual_quantity'] = "Actual Quantity";
$productArray[0]['cost'] = "Cost";

$i = 1;


foreach($myArray as $products){


$productArray[$i]['code'] = $products['sku'];
$productArray[$i]['name'] = "";
$productArray[$i]['product_group_description'] = "";
$productArray[$i]['actual_quantity']  = $products['qty'];
$productArray[$i]['cost'] = $products['price'];
$i++;

}

/* echo '<pre>';
print_r($productArray);
exit; */


$remote_file_name = 'productbody/Powerbody.csv';


$fp = fopen($remote_file_name, 'w');

foreach ($productArray as $row) {
    fputcsv($fp, $row);
}
//rewind($fp);
//ftp_fput($ftp_conn, $remote_file_name, $fp, FTP_ASCII);

fclose($fp);


?>