How to Access JSON POST Request Body in PHP?

How to Acquire POST Request Body as JSON in PHP?

When submitting JSON data as POST to a PHP page, accessing its value may seem challenging, as var_dump($_POST); returns an empty array. To retrieve the JSON payload, a special input stream is required.

Using php://input or STDIN

To access the raw entity body of a POST request:

$entityBody = file_get_contents('php://input');

Alternatively, one can use STDIN:

$entityBody = stream_get_contents(STDIN);

php://input Considerations

• php://input is a read-only stream.
• It should be used instead of $HTTP_RAW_POST_DATA as it's more reliable and doesn't depend on php.ini directives.
• Php://input is not supported for enctype="multipart/form-data" requests.

Preserving Readability of php://input

Since php://input is not seekable, it can only be read once. To preserve the input stream:

function detectRequestBody() {
    $rawInput = fopen('php://input', 'r');
    $tempStream = fopen('php://temp', 'r+');
    stream_copy_to_stream($rawInput, $tempStream);
    rewind($tempStream);

    return $tempStream;
}

Handling Multipart/Form-Data Requests

For multipart/form-data requests, the JSON payload is available directly in the $_POST superglobal.

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