How to send a POST request containing JSON data using PHP's cURL library?

This article will demonstrate how to use PHP's cURL library to send POST requests containing JSON data and interact with external APIs. Suppose you need to send JSON data containing appid , secret and an fields to the target server.

Solution:

Use the curl_setopt_array function to set the cURL option to realize the POST request to send JSON data. The following code snippet shows the specific implementation:

 <?php $curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => 'http://localhost/xxx', // Replace with your target URL
  CURLOPT_RETURNTRANSFER => true, // Return the result as the string CURLOPT_ENCODING => '', // Allow any encoding CURLOPT_MAXREDIRS => 10, // Maximum redirection CURLOPT_TIMEOUT => 0, // Timeout, 0 means infinite CURLOPT_FOLLOWLOCATION => true, // Allow redirection CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1, // HTTP version CURLOPT_CUSTOMREQUEST => 'POST', // The request method is POST
  CURLOPT_POSTFIELDS => json_encode([ // Use json_encode function to encode JSON data "appid" => "111",
    "secret" => "ddd111",
    "an" => "xxx"
  ]),
  CURLOPT_HTTPHEADER => [
    'Content-Type: application/json', // Specify the content type as JSON
    'Cookie: lang=zh-cn; ssid=02bebb340032d3a9e4b15463dd7d0eaa' // Optional Cookie
  ],
]);

$response = curl_exec($curl); // Execute the request curl_close($curl); // Close the cURL resource echo $response; // Output the response result?>

Code description:

• CURLOPT_POSTFIELDS uses the json_encode function to encode the PHP array into a JSON string to ensure the correct format of the data.
• CURLOPT_HTTPHEADER sets Content-Type to application/json and tells the server that the request body is JSON format. Please replace the target URL, JSON data and cookie information according to the actual situation.

In order to more conveniently debug and generate cURL request codes in different languages, it is recommended to use tools such as Postman. Postman can generate code snippets in multiple languages, including PHP's cURL code, which facilitates developers to quickly build and test requests.

With Postman or similar tools, you can more effectively understand the meaning of parameters and set methods, so that API interactions are more efficient.

The above is the detailed content of How to send a POST request containing JSON data using PHP's cURL library?. For more information, please follow other related articles on the PHP Chinese website!