/**
*create a number of product
*/
public static function createSku()
{
$charlist = '0123456789';
$rand = StringUtil::rndString(6, 0, $charlist);
$currentChar = time() . $rand;
$result = Product::getSku($currentChar);
if (empty($result)) {
return ['number' => $currentChar];
} else {
self::createNum();
}
}
