Why is my PHP cURL POST request returning an empty JSON array?

Posting JSON Data with PHP cURL: Troubleshooting Empty Result Array

When attempting to post JSON data with PHP cURL, you may encounter an issue where the resulting array remains empty. This article addresses this problem and provides a solution.

Incorrect JSON Posting

In your provided code, the JSON data is incorrectly formatted for posting. Instead of using curl_setopt($ch, CURLOPT_POSTFIELDS, array("customer" => $data_string)), you should encode the entire data array as JSON and post it as the payload: curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(array("customer" => $data))).

Unexpected Result

Even with the correct JSON formatting, using print_r ($_POST) to retrieve the posted data is ineffective. To access the incoming JSON data, use file_get_contents("php://input") on the receiving page.

Improved Code Snippet

The following code snippet demonstrates the correct approach:

$ch = curl_init($url);

# Setup request to send json via POST.
$payload = json_encode(array("customer" => $data));
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json'));

# Return response instead of printing.
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

# Send request.
$result = curl_exec($ch);
curl_close($ch);

# Print response.
echo "<pre class="brush:php;toolbar:false">$result

Third-Party Libraries

Consider leveraging third-party libraries for interfacing with the Shopify API. This can simplify the process and provide additional functionality.

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