Why is my PHP $_POST array empty when submitting a JSON form?

Empty $_POST arrays in PHP despite Form Submission

A developer encountered an issue where $_POST arrays remained empty after form submissions despite successful data transfer via file_get_contents('php://input').

Analysis

Upon investigating content-type headers, the issue was identified to be related to using JSON as the content type. Contrary to multi-part forms, utilizing JSON content types prohibits data from populating in the $_POST array.

Solution

To resolve this issue, the developer provided the following code snippet:

$_POST = json_decode(file_get_contents("php://input"), true);

This code snippet parses the JSON payload and converts it into an associative array, which is then assigned to the $_POST variable. By doing so, the data from the JSON payload becomes accessible through the $_POST array as expected.

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