PHP Code

// Modify product data
$modify_data = array(
	"product" => array(
		"id" => $product_id,
		"title" => "My New Title"
	)
);

// Run API call to modify the product
$modified_product = shopify_call($token, $shop, "/admin/products/" . $product_id . ".json", $modify_data, 'PUT');

// Storage response
$modified_product_response = $modified_product['response'];

You have used curl in all your example and for actual api call you have used something else. Can you please put a curl example.
Thanks