Why is my JSON data arriving as an empty array in PHP after a cURL POST?

How to Correctly Interpret JSON Data Posted to PHP with cURL

In your attempt to post JSON data to a PHP backend using cURL, you encountered an issue where the posted data appeared as an empty array in PHP. This discrepancy arises from a misunderstanding of how cURL interprets the -d parameter.

By default, cURL assumes that the data sent with the -d parameter is form-encoded. However, in your case, you are sending JSON data. To address this, you need to specify the Content-Type header using the -H parameter:

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

With this modification, cURL will properly send the data as JSON, and PHP will be able to parse it correctly. As a result, you should expect to receive a valid response that includes the processed JSON data.

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