Why Are My cURL JSON POST Arrays Empty in PHP?

Posting JSON to PHP with cURL: Resolving Empty POST Arrays

In a recent PHP framework tutorial, users encountered an issue while attempting to post JSON data to PHP using cURL. The issue stemmed from an empty array being returned, indicating that PHP was not interpreting the POST correctly.

Understanding PHP's Interpretation of JSON POSTs

By default, cURL's -d parameter interprets data as form-encoded. However, JSON is not a form-encoded format. For PHP to properly interpret JSON, you must specify the content type as application/json.

Solution:

To resolve this issue, include the following -H parameter:

-H "Content-Type: application/json"

before the -d parameter. This specifies the content type of the POST data as JSON.

Modified cURL Command:

The updated cURL command should look like this:

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

With this modification, PHP will now correctly interpret your POST data as JSON, and you should no longer encounter empty arrays.

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