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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