Creating a product variant using PHP

variantCreate.php

<?php
$ch = curl_init("https://key:pass@appsrule.myshopify.com/admin/products/1075339140/variants.json");
$variant = json_encode(array('variant'=> array('option1' => 'test')));
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST"); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $variant); 
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
$response = curl_exec($ch);