Need to update Product variant 'title' by Admin REST API

[Sansaar]

We need to update the variant title by REST API

I already coded for the updated Title in PHP but still have not updated it. The Code is running successfully. 

That is PHP Code please give me Solution 

$shopifyStore = SHOP . '.myshopify.com';
$apiKey = API_KEY;
$password = PASSWORD;

$apiKey = API_KEY;
$password = PASSWORD;
$shopUrl = $shopifyStore;
$variantId = $QUR[0]['shopify_product_variant_id']; // Replace with the actual variant ID
$newVariantTitle = base64_decode($QUR[0]['item_name']); // Replace with the desired new title

$apiUrl = "https://$apiKey:$password@$shopUrl/admin/api/" . APIV;

$variantData = [
    
    'variant' => [
        'id' => $variantId,
        'title' => $newVariantTitle,
        
    ],
];
//pre($variantData);
echo "$apiUrl/variants/$variantId.json";
$ch = curl_init("$apiUrl/variants/$variantId.json");

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($variantData));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
]);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

if (curl_errno($ch)) {
    echo 'Error updating variant title: ' . curl_error($ch);
} else {
    $responseData = json_decode($response, true);
    pre($responseData);
}