How to Send JSON POST Requests in PHP using CURL?

Making JSON POST Requests in PHP

Sending POST requests with JSON data is a common task in web development. In PHP, CURL is an excellent library for handling these requests.

Example Code

The following PHP code demonstrates how to send a JSON POST request using CURL:

$url = "your url";
$content = json_encode("your data to be sent");

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER,
        array("Content-type: application/json"));
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $content);

$json_response = curl_exec($curl);

$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);

if ( $status != 201 ) {
    die("Error: call to URL $url failed with status $status, response $json_response, curl_error " . curl_error($curl) . ", curl_errno " . curl_errno($curl));
}

curl_close($curl);

$response = json_decode($json_response, true);

Explanation of the Code

• curl_init() initializes a CURL session.

• curl_setopt() sets various options for the session, such as:

  • CURLOPT_HEADER: Disable header output.
  • CURLOPT_RETURNTRANSFER: Return the response as a string instead of echoing it.
  • CURLOPT_HTTPHEADER: Set the "Content-type" header to "application/json".
• curl_setopt() sets the POST parameters.
• curl_exec() executes the CURL request.
• curl_getinfo() retrieves the HTTP status code.
• curl_close() closes the CURL session.

If the HTTP status code is not 201 (Created), an error is thrown.

• json_decode() parses the JSON response.

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