How to Properly Post JSON Data to a PHP Server Using cURL?

Posting JSON to PHP Using curl: Unveiling the Missing Link

When attempting to utilize the curl post command for JSON data transmission in PHP, one may encounter the issue of an empty array as the PHP interpretation of the POST data. To resolve this, the secret lies in altering the command structure.

Addressing the Misinterpretation

By default, the -d parameter in curl expects form-encoded data. To instruct PHP to correctly interpret the JSON content, the -H parameter must be introduced. The correct command syntax is as follows:

curl -v -H "Content-Type: application/json" -X POST -d '{"screencast":{"subject":"tools"}}' \
http://localhost:3570/index.php/trainingServer/screencast.json

By specifying "Content-Type: application/json" in the -H parameter, we inform PHP that the POST data is in JSON format. This allows PHP to properly parse and handle the JSON object and assign the "tools" value to the "subject" property.

Example Response

Upon executing the modified command, the response from the PHP server will now reflect the correctly interpreted JSON data, removing the issue of an empty array:

HTTP/1.1 200 OK
Date: Fri, 01 May 2009 22:03:00 GMT
Server: Apache/2.2.8 (Win32) PHP/5.2.6
Content-Type: application/json; charset=utf-8

{
  "screencast": {
    "id": null,
    "subject": "tools",
    "body": null,
    "dataUrl": null,
    "dataMedium": null,
    "createdOn": null,
    "author": null
  }
}

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